List of the Paleozoic life of Indiana

This list of the Paleozoic life of Indiana contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Indiana and are between 541 and 252.17 million years of age.

A
  • †Abatocrinus
    • †Abatocrinus grandis
  • Fossilized calyx of the Carboniferous crinoid ("sea lily") Abrotocrinus
    †Abrotocrinus
    • †Abrotocrinus coreyi
    • †Abrotocrinus nodosus
    • †Abrotocrinus unicus
  • †Acacocrinus
    • †Acacocrinus americanus
  • †Acanthopecten
    • †Acanthopecten procarboniferous
  • †Achistrum
    • †Achistrum brevis – type locality for species
    • †Achistrum ludwigi
    • †Achistrum nicholsoni
    • †Achistrum triassicum
  • †Achradocrinus
  • †Acidaspis
  • †Acinophyllum
    • †Acinophyllum davisi – type locality for species
  • †Acratia
    • †Acratia similaris
  • †Acrocrinus
    • †Acrocrinus constrictus
  • † Acrophyllum
    • †Acrophyllum ellipticum
    • †Acrophyllum oneidaense
    • †Acrophyllum rugosum
  • Fossilized calyx and partial stem of the Devonian-Permian crinoid ("sea lily") Actinocrinites
    †Actinocrinites
    • †Actinocrinites gibsoni
    • †Actinocrinites grandissimus
    • †Actinocrinites lobatus – tentative report
    • †Actinocrinites lowei
  • †Actinopteria
    • †Actinopteria boydi
  • †Actinostroma
  • †Adinocrinus
    • †Adinocrinus nodosus
  • †Aemuliophyllum
    • †Aemuliophyllum exiguum
  • †Aganaster
    • †Aganaster gregarius
  • †Agaricocrinites
  • †Agaricocrinus
  • †Agassizocrinus
    • †Agassizocrinus gibbosus – or unidentified comparable form
    • †Agassizocrinus laevis – or unidentified comparable form
  • †Ageneracrinus
    • †Ageneracrinus basalotumidus
  • †Ahrensisporites
    • †Ahrensisporites guerickei
  • †Aipoceras – tentative report
  • †Alaskadiscus
    • †Alaskadiscus magnus
  • †Alatisporites
    • †Alatisporites trialatus
  • Fossilized fronds of the Carboniferous-Early Cretaceous seed fern Alethopteris
    †Alethopteris
    • †Alethopteris davreuxi
    • †Alethopteris decurrens
    • †Alethopteris grandini
    • †Alethopteris lonchitica
    • †Alethopteris owenii
    • †Alethopteris serlii
  • †Alisocrinus
    • †Alisocrinus aureatus
    • †Alisocrinus caleyi
    • †Alisocrinus laevis
  • †Allocrinus
    • †Allocrinus benedicti
  • †Allocystites
    • †Allocystites hammeli
  • †Alloprosallocrinus
    • †Alloprosallocrinus conicus
  • †Allorhynchus
    • †Allorhynchus curriei
  • †Alveolites
    • †Alveolites asperus
    • †Alveolites constans
    • †Alveolites dispansus
    • †Alveolites expatiatus
    • †Alveolites goldfussi
    • †Alveolites minimus
    • †Alveolites mordax
    • †Alveolites squamosus
    • †Alveolites winchellana
  • †Amaurotoma
    • †Amaurotoma leavenworthana – type locality for species
    • †Amaurotoma subangulatum – type locality for species
  • †Ambocoelia
  • †Ambonychia
    • †Ambonychia obesa
    • †Ambonychia robusta
    • †Ambonychia suberecta
  • Ammobaculites
    • †Ammobaculites leptos
    • †Ammobaculites pyriformis
  • Ammodiscus
    • †Ammodiscus longexsertus
  • †Ammonellipsites
  • †Ammovertella
    • †Ammovertella inclusa
  • †Ampheristocystis
    • †Ampheristocystis concentricus
  • †Amphipora
  • †Amphipsalidocrinus – type locality for genus
    • †Amphipsalidocrinus inconsuetus
    • †Amphipsalidocrinus scissurus – type locality for species
  • †Amphissites
    • †Amphissites similaris
  • †Amphistrophia
  • †Amphoracrinus
  • †Amplexiphyllum
    • †Amplexiphyllum cruciforme
    • †Amplexiphyllum simplex – tentative report
    • †Amplexiphyllum tenue
  • †Amplexizaphrentis
    • †Amplexizaphrentis spinulosus
  • Fossils of the Ordovician-Permian bryozoan Amplexopora
    †Amplexopora
    • †Amplexopora discoidea – or unidentified comparable form
  • †Amplexus
  • †Anachoropteris
    • †Anachoropteris involuta
  • †Anapiculatisporites
    • †Anapiculatisporites baccatus
    • †Anapiculatisporites spinosus
  • †Anartiocystis
  • †Anastrophia
    • †Anastrophia internascens
  • †Anchiopsis
  • †Ancyrocrinus
    • †Ancyrocrinus bulbosus
  • †Anematina
    • †Anematina proutana – type locality for species
  • †Angustidontus
    • †Angustidontus seriatus
  • †Angyomphalus
    • †Angyomphalus northviewensis – or unidentified related form
  • †Anisocrinus
    • †Anisocrinus laurelensis
  • †Anisotrypa
    • †Anisotrypa solida
  • †Ankyropteris
    • †Ankyropteris brongnartii
  • Fossil of the Carboniferous horsetail relative Annularia
    †Annularia
    • †Annularia mucronata
    • †Annularia radiata
    • †Annularia sphenophylloides
    • †Annularia stellata
  • †Anomalodonta
    • †Anomalodonta gigantea
  • †Anopliopsis
    • †Anopliopsis subcarinata
  • †Anthracospirifer
    • †Anthracospirifer leidyi
  • †Antirhynchonella
  • †Aphelakardia
    • †Aphelakardia indianense
  • †Aphelecrinus
    • †Aphelecrinus oweni
    • †Aphelecrinus randolphensis
  • †Aphelotoxon
  • †Aphlebia
    • †Aphlebia crispa
  • †Apiculatasporites
    • †Apiculatasporites latigranifer
  • †Apiculatisporites
    • †Apiculatisporites abditus
    • †Apiculatisporites lappites
    • †Apiculatisporites setulosus
  • †Arabellites
    • †Arabellites comis
    • †Arabellites conspicuous – or unidentified comparable form
    • †Arabellites cultriformis – or unidentified comparable form
    • †Arabellites hamiltonesis
  • †Arachnophyllum
    • †Arachnophyllum striatum – or unidentified comparable form
  • †Archaeopitys
    • †Archaeopitys eastmanii
  • Fossils of the Carboniferous-Permian bryozoan Archimedes
    †Archimedes
    • †Archimedes communis
    • †Archimedes compactus
    • †Archimedes distans
    • †Archimedes intermedius
    • †Archimedes invaginatus
    • †Archimedes lativolvis
    • †Archimedes macfarlani
    • †Archimedes meekanoides
    • †Archimedes meekanus
    • †Archimedes negligens – or unidentified comparable form
    • †Archimedes proutanus
    • †Archimedes swallovanus
    • †Archimedes swallowvanus
    • †Archimedes symmetricus
    • †Archimedes terebriformis
  • †Archinacella
    • †Archinacella indianensis – type locality for species
  • Fossil of the Silurian trilobite Arctinurus
    †Arctinurus
    • †Arctinurus boltoni
  • †Arjamannia
    • †Arjamannia aulangonensis
  • †Armenoceras
    • †Armenoceras madisonense
  • †Arnoldella
    • †Arnoldella minuta
  • †Arthroacantha
    • †Arthroacantha carpenteri
  • †Arthropitys
    • †Arthropitys communis
  • †Artisia
  • †Asaphocrinus
    • †Asaphocrinus minor
  • †Ascoceras
    • †Ascoceras newberryi
    • †Ascoceras wabashense
  • †Ascodictyon
  • †Ascopora
  • †Aspidiaria
  • †Asterophyllites
    • †Asterophyllites equisetiformis
    • †Asterophyllites grandis
  • †Asterotheca
    • †Asterotheca crenulata
    • †Asterotheca cyathea
    • †Asterotheca hemitelliodes
    • †Asterotheca miltoni
    • †Asterotheca oreopteridia
  • Life restoration of the Early Devonian club moss relative Asteroxylon
    †Asteroxylon
    • †Asteroxylon setchelli
  • †Astraeospongium
  • †Astylospongia
    • †Astylospongia praemorsa
  • †Atactoporella
  • †Atelodictyon
  • †Athyris
    • †Athyris fultonensis
    • †Athyris lamellosa
    • †Athyris parvirostra
    • †Athyris spiriferoides
  • †Atrypa
    • †Atrypa newsomensis
    • †Atrypa parva – or unidentified comparable form
    • †Atrypa reticularis
    • †Atrypa reticularus
  • †Atrypina
    • †Atrypina disparilis
  • †Aulacophyllum
    • †Aulacophyllum mutabile
    • †Aulacophyllum parvum
    • †Aulacophyllum perlamellosum
    • †Aulacophyllum pinnatum
    • †Aulacophyllum sulcatum
  • †Aulacotheca
  • †Aulocystis
    • †Aulocystis auloporidea
    • †Aulocystis incrustans – tentative report
    • †Aulocystis jacksoni
    • †Aulocystis lucasensis
    • †Aulocystis nobilis
    • †Aulocystis procumbens – tentative report
    • †Aulocystis transitorius – type locality for species
  • Fossil of the Late Ordovician-Permian tabulate coral Aulopora
    †Aulopora
    • †Aulopora edithana
    • †Aulopora microbuccinata
    • †Aulopora tubiporoides
  • †Auloporella
  • †Aviculopecten
    • †Aviculopecten colletti
    • †Aviculopecten invalidus
    • †Aviculopecten spinuliferus
    • †Aviculopecten terminalis
  • † Avonia – tentative report
  • † Avonia

B
  • Bairdia
    • †Bairdia compacta
    • †Bairdia egorovi – or unidentified related form
    • †Bairdia kinderhookensis – or unidentified related form
  • †Barroisella
    • †Barroisella campbelli
  • †Barycrinus
    • †Barycrinus asperrimus
    • †Barycrinus asteriscus
    • †Barycrinus cornutus
    • †Barycrinus hoveyi
    • †Barycrinus stenobrachium
  • †Baryschyr
    • †Baryschyr anosus
  • †Batocrinus
    • †Batocrinus grandis
    • †Batocrinus isodactylus
  • †Batostoma
    • †Batostoma prosseri
    • †Batostoma varians
  • †Batostomella
  • †Beatricea
    • †Beatricea undulata
  • †Beecheria
    • †Beecheria illinoisense
    • †Beecheria shumardanum – tentative report
    • †Beecheria sinuata
  • †Belemnospongia
    • †Belemnospongia fascicularis
    • †Belemnospongia parmula
  • Fossilized shell of the Silurian-Early Triassic mollusc Bellerophon
    †Bellerophon
    • †Bellerophon gibsoni – type locality for species
    • †Bellerophon jeffersonensis
    • †Bellerophon spergensis – type locality for species
  • †Belodella
    • †Belodella resima – or unidentified comparable form
  • †Beloitoceras
    • †Beloitoceras amoenum – type locality for species
    • †Beloitoceras bucheri
    • †Beloitoceras chapparsi
    • †Beloitoceras cumingsi
    • †Beloitoceras ohioense
    • †Beloitoceras transiens
  • †Bembexia
    • †Bembexia minima
  • Berenicea
  • †Bethacanthus – type locality for genus
    • †Bethacanthus insolitus – type locality for species
  • †Bethanyphyllum
    • †Bethanyphyllum arctifossa
    • †Bethanyphyllum depresstum
    • †Bethanyphyllum pocillum
    • †Bethanyphyllum robustum
    • †Bethanyphyllum validum
    • †Bethanyphyllum vesiculatum
  • †Beyrichoceras
  • †Bigalea
    • †Bigalea ohioensis – type locality for species
  • †Billingsastrea
    • †Billingsastrea yandelli
  • †Blothrophyllum
    • †Blothrophyllum bellicinctum
    • †Blothrophyllum corium
    • †Blothrophyllum greeni – tentative report
    • †Blothrophyllum romingeri – type locality for species
    • †Blothrophyllum sinuosum
    • †Blothrophyllum tripinnatum
    • †Blothrophyllum trisulcatum
    • †Blothrophyllum zaphrentiforme
  • †Blountia – tentative report
  • †Bordonia
    • †Bordonia knappi
  • †Bothrodendron
    • †Bothrodendron minutifolium
  • †Botryocrinus
    • †Botryocrinus nucleus
    • †Botryocrinus polyxo
  • †Brachythyris
    • †Brachythyris fernglenensis – or unidentified related form
    • †Brachythyris suborbicularis
  • †Brahmacrinus
    • †Brahmacrinus elongatus
  • †Brittsia
    • †Brittsia problematica
  • †Brockocystis
    • †Brockocystis nodosaria
  • †Bucania
    • †Bucania simulatrix – type locality for species
  • †Bucanophyllum
    • †Bucanophyllum ohioense
  • †Bucanopsis
  • †Bulimorpha
    • †Bulimorpha bulimiformis – type locality for species
    • †Bulimorpha elongata – type locality for species
  • †Bullimorpha
  • Fossil of the Early Ordovician-Silurian trilobite Bumastus
    †Bumastus
    • †Bumastus armatus – or unidentified comparable form
    • †Bumastus insignis
    • †Bumastus ioxus
    • †Bumastus niagarense – or unidentified comparable form
  • †Bynumina
  • †Byssonychia
    • †Byssonychia richmondensis
  • †Bythocyproidea
  • †Bythopora
    • †Bythopora delicatula
    • †Bythopora gracilis
    • †Bythopora meeki
    • †Bythopora striata

C
  • Fossilized stems from the Carboniferous-Permian horsetail relative Calamites
    †Calamites
    • †Calamites cruciatus
    • †Calamites suckowii
  • †Calamodendron
    • †Calamodendron americanum
  • †Calamospora
    • †Calamospora breviradiata
    • †Calamospora flava
    • †Calamospora hartungiana
    • †Calamospora liquida
    • †Calamospora mutabilis
    • †Calamospora straminea
  • †Calamostachys
    • †Calamostachys paniculata – tentative report
    • †Calamostachys superba
    • †Calamostachys tuberculata
  • †Calceocrinus
  • †Calliocrinus
    • †Calliocrinus beachleri
    • †Calliocrinus cornutus
  • †Callipleura
    • †Callipleura nobilis
  • Fossilized fronds of the Carboniferous seed fern Callipteridium
    †Callipteridium
    • †Callipteridium sullivanti
  • †Callistophyton
    • †Callistophyton boysettii
  • †Callixylon
    • †Callixylon brownii
    • †Callixylon newberryi
  • †Callocystites
    • †Callocystites brevis
  • †Calocephalites
  • †Calostylis
    • †Calostylis trigemma – tentative report
  • †Calymene
  • †Calyptactis
    • †Calyptactis confragosus
  • †Camarotoechia
    • †Camarotoechia gregaria – tentative report
    • †Camarotoechia horsfordi
    • †Camarotoechia mutata
    • †Camarotoechia neglecta – or unidentified comparable form
    • †Camarotoechia pisa
    • †Camarotoechia tethys
  • †Camptocrinus
    • †Camptocrinus plenicirrus
  • Fossil of the Silurian eurypterid ("sea scorpion") Carcinosoma
    †Carcinosoma
    • †Carcinosoma newlini
  • †Cardiocarpon
    • †Cardiocarpon annulatum
    • †Cardiocarpon dilatatus
    • †Cardiocarpon ingens – tentative report
    • †Cardiocarpon latealatum
  • †Carneyella
  • †Carpocrinus
    • †Carpocrinus sculptus
  • †Carpomanon
  • †Caryocrinites
    • †Caryocrinites bulbulus
    • †Caryocrinites ellipticus
    • †Caryocrinites indianensis
    • †Caryocrinites laurelensis
    • †Caryocrinites sphaeroidalis
    • †Caryocrinites stellatus
  • Life restoration of the Carboniferous Chimaera relative Caseodus
    †Caseodus
    • †Caseodus eatoni – type locality for species
  • †Catazyga
    • †Catazyga headi
  • †Catillocrinus
    • †Catillocrinus turbinatus
    • †Catillocrinus wachsmuthi
  • †Cavellina
  • †Cayrocrinites
  • †Cayugaea
    • †Cayugaea subcylindrica
  • †Cayugea
  • †Centronella
    • †Centronella campbelli
    • †Centronella impressa
    • †Centronella navicella
  • †Ceramopora
    • †Ceramopora imbricata
    • †Ceramopora vesicularis
  • †Ceramoporella
    • †Ceramoporella ohioensis
  • †Ceraurinus
    • †Ceraurinus icarus
  • †Ceraurus
  • †Cervifurca – type locality for genus
    • †Cervifurca nasuta – type locality for species
  • †Chancelloria
  • †Charactoceras
    • †Charactoceras baeri
    • †Charactoceras faberi
  • †Cheilocephalus
  • Fossil of the Cambrian-Middle Devonian trilobite Cheirurus
    †Cheirurus
    • †Cheirurus dilatatus
  • †Chilotrypa
    • †Chilotrypa ostiolata
  • †Chomatodus
  • †Chondrites
  • †Chonetes
    • †Chonetes geniculatus
    • †Chonetes yandellanus
  • †Chonophyllum
    • †Chonophyllum nanum
  • †Chonostegites
    • †Chonostegites clappi
    • †Chonostegites tabulatus
  • †Cincinnaticrinus
  • Assemblage of fossilized shells of the Ordovician brachiopod Cincinnetina
    †Cincinnetina
    • †Cincinnetina meeki
    • †Cincinnetina multisecta
  • †Cingularia
  • †Cingulizonates
    • †Cingulizonates loricatus
  • †Cirratriradites
    • †Cirratriradites annulatus
    • †Cirratriradites annuliformis
  • †Cladochonus
    • †Cladochonus beecheri
    • †Cladochonus crassus
    • †Cladochonus longi
  • †Cladopora
    • †Cladopora acupicta
    • †Cladopora bifurca
    • †Cladopora gracilis – tentative report
    • †Cladopora gulielmi
    • †Cladopora imbricata – tentative report
    • †Cladopora robusta – tentative report
    • †Cladopora roemeri
  • †Cladoxylon
  • †Clathrodictyon
  • †Clathrospira
    • †Clathrospira subconica
  • †Cleiodictya
    • †Cleiodictya gloriosa
  • Fossilized shell of the Middle Devonian-Permian brachiopod Cleiothyridina
    †Cleiothyridina
    • †Cleiothyridina hirsuta
    • †Cleiothyridina obmaxima
    • †Cleiothyridina parvirostra
    • †Cleiothyridina pravirostra
    • †Cleiothyridina sublamellosa
  • †Cleodictya
  • †Clepsidropsis
    • †Clepsidropsis titan
  • †Clepsydropsis
    • †Clepsydropsis bertrandi
    • †Clepsydropsis chaneyi
  • †Clinopistha
    • †Clinopistha exacutus
  • †Cliotrypa
  • †Clorinda – tentative report
  • †Codonotheca
    • †Codonotheca caduca
  • †Coelocerododontus
    • †Coelocerododontus biconvexus – or unidentified comparable form
  • †Coelochilina
    • †Coelochilina striatomarginata
  • †Coeloclema
  • †Coelospira
  • †Coenites
    • †Coenites brownsportensis
    • †Coenites cryptodens – or unidentified comparable form
    • †Coenites laqueata – or unidentified comparable form
    • †Coenites rectilineatus
  • †Coleophyllum
    • †Coleophyllum romingeri
  • †Columnaria
    • †Columnaria alveolata
    • †Columnaria vacua
  • †Complexisporites
    • †Complexisporites chalonerii
  • Fossilized shell of the Late Devonian-Permian brachiopod Composita
    †Composita
    • †Composita globosa
    • †Composita subquadrata
    • †Composita sulcata
    • †Composita trinuclea
  • †Compressiphyllum
    • †Compressiphyllum davisana
  • †Concavicaris
  • †Conchidium
    • †Conchidium biolularis – or unidentified comparable form
    • †Conchidium exporrecta
    • †Conchidium laqueatum
    • †Conchidium littoni – or unidentified comparable form
  • †Conocardium
    • †Conocardium richmondense – type locality for species
  • Fossil of the Ordovician bryozoan Constellaria
    †Constellaria
    • †Constellaria limitaris
    • †Constellaria polystomella
  • †Conularia
    • †Conularia formosa
  • †Convolutipora
    • †Convolutipora florida
  • †Convolutispora
    • †Convolutispora fromensis
  • †Coolinia
    • †Coolinia subplana
  • †Cordaianthus
    • †Cordaianthus gemmifer
  • †Cordaicarpon – tentative report
  • †Cordaites
    • †Cordaites borassifolius
    • †Cordaites crassinervis
    • †Cordaites principalis
  • †Cornulitella
  • Fossil of the Middle Ordovician-Carboniferous horn coral Cornulites
    †Cornulites
    • †Cornulites formosa
    • †Cornulites proprius
  • Cornuspira
    • †Cornuspira semiconstrictus
  • †Coronura
    • †Coronura aspectans
  • †Corynotrypa
    • †Corynotrypa dissimilis
  • †Costalocrinus
    • †Costalocrinus rex
  • †Costatulites
    • †Costatulites richmondensis
  • †Cranaena
    • †Cranaena lincklaeni
    • †Cranaena romingeri
    • †Cranaena subcircularis
    • †Cranaena sulcata
    • †Cranaena sullivanti
  • †Crania
    • †Crania chesterensis
  • †Craniops
    • †Craniops hamiltonae
    • †Craniops hamiltoniae
  • †Crassispora
    • †Crassispora kosankei
    • †Crassispora plicata
  • †Craterophyllum
    • †Craterophyllum latiradium – tentative report
    • †Craterophyllum magnificum
  • †Cribanocrinus
    • †Cribanocrinus coxanus
  • †Cribroconcha – tentative report
  • †Cristatisporites
    • †Cristatisporites alpernii
  • †Crossotheca
    • †Crossotheca sagittata
  • Fossilized stem segments of the Silurian crinoid ("sea lily") Crotalocrinites
    †Crotalocrinites
  • †Crotalocrinus
    • †Crotalocrinus cora
  • †Crurithyris
    • †Crurithyris parva
  • †Cryptonella
    • †Cryptonella lens
    • †Cryptonella ovalis
  • †Crytobairdia
    • †Crytobairdia compacta
  • †Ctenocrinus
    • †Ctenocrinus granulosus
  • †Ctenodonta
    • †Ctenodonta iphegenia
    • †Ctenodonta madisonensis
  • †Cuffeyella
    • †Cuffeyella arachnoidea
  • †Cunctocrinus
    • †Cunctocrinus fortunatus
  • †Cuneamya
    • †Cuneamya miamiensis
  • †Cupularostrum
    • †Cupularostrum exima
  • †Cupulocorona
    • †Cupulocorona gemmiformis
    • †Cupulocorona hammeli
    • †Cupulocorona osgoodensis
  • †Cupulocrinus
    • †Cupulocrinus gemmiformis
  • †Cyathaxonia
    • †Cyathaxonia cyndon
    • †Cyathaxonia tantilla
  • Fossilized calyx and partial stem of the Silurian-Permian crinoid ("sea lily") Cyathocrinites
    †Cyathocrinites
    • †Cyathocrinites glenni – or unidentified comparable form
    • †Cyathocrinites multibrachiatus
    • †Cyathocrinites parvibrachiatus
    • †Cyathocrinites pauli
    • †Cyathocrinites sanduskyensis
    • †Cyathocrinites striatissimus
    • †Cyathocrinites wilsoni
  • †Cyathophyllum – tentative report
  • †Cycloconcha
    • †Cycloconcha milleri
  • †Cyclocyclopa
  • †Cyclogranisporites
    • †Cyclogranisporites aureus
    • †Cyclogranisporites breviradiatus
    • †Cyclogranisporites microgranus
    • †Cyclogranisporites minutus
    • †Cyclogranisporites obliquus
    • †Cyclogranisporites orbicularis
    • †Cyclogranisporites staplini
  • †Cycloholcus
  • †Cyclonema
    • †Cyclonema bilix
    • †Cyclonema daytonensis
    • †Cyclonema gyronemoides
    • †Cyclonema type locality for species – informal
  • †Cyclopentagonopa
  • Fossilized foliage from the Carboniferous seed fern Cyclopteris
    †Cyclopteris
    • †Cyclopteris orbicularis
    • †Cyclopteris trichomanoides
  • †Cyclospongia
    • †Cyclospongia discus
  • †Cyclotrypa
  • †Cylicocrinus
    • †Cylicocrinus canaliculatus
    • †Cylicocrinus indianensis
    • †Cylicocrinus spinosus
  • †Cylindrophyllum
    • †Cylindrophyllum compactum
  • †Cymatonota
    • †Cymatonota recta
    • †Cymatonota suberecta
  • Fossil of the Late Ordovician-Late Devonian trilobite Cyphaspis
    †Cyphaspis
    • †Cyphaspis christyi
  • †Cyphocrinus
    • †Cyphocrinus gorbyi
  • †Cyphotrypa
    • †Cyphotrypa osgoodensis
  • †Cypricardinia
    • †Cypricardinia indenta
    • †Cypricardinia scitula
  • †Cyrtia
    • †Cyrtia exporrecta
  • †Cyrtina
    • †Cyrtina burlingtonensis
    • †Cyrtina hamiltonensis
  • †Cyrtocerina
    • †Cyrtocerina carinifera
    • †Cyrtocerina madisonensis
    • †Cyrtocerina modesta
    • †Cyrtocerina patella
  • †Cyrtodontula
    • †Cyrtodontula sterlingensis
  • †Cyrtolites
    • †Cyrtolites hornyi
    • †Cyrtolites ornatus
    • †Cyrtolites sinuosus
  • Fossilized shells of the Middle-Late Devonian brachiopod Cyrtospirifer
    †Cyrtospirifer
    • †Cyrtospirifer latior
  • †Cystelasma
  • †Cystihalysites
    • †Cystihalysites magnituba
  • †Cystiphylloides
    • †Cystiphylloides americanum
    • †Cystiphylloides cicatriciferum
    • †Cystiphylloides hispidum
    • †Cystiphylloides infundibuliformis
    • †Cystiphylloides nanum
    • †Cystiphylloides plicatum
    • †Cystiphylloides pustulatum
    • †Cystiphylloides quadrangulare
    • †Cystiphylloides squamosum
    • †Cystiphylloides tenuiradium
  • †Cystiphyllum
  • †Cystodictya
    • †Cystodictya lineata
  • †Cytocrinus

D
  • †Dalejina
    • †Dalejina euorthis
    • †Dalejina hybrida
    • †Dalejina newsomensis
  • Fossil of the Late Ordovician-Middle Devonian trilobite Dalmanites
    †Dalmanites
    • †Dalmanites halli
    • †Dalmanites limulurus
  • †Danaea
    • †Danaea meccaensis
  • †Dawsonoceras
    • †Dawsonoceras americanum
    • †Dawsonoceras annulatum
  • †Decadocrinus
    • †Decadocrinus depressus
    • †Decadocrinus stellatus – type locality for species
  • †Decadorinus
  • †Decaschisma
    • †Decaschisma pulchellum
  • †Decatocrinus
  • †Deceptrix
    • †Deceptrix albertina
    • †Deceptrix decipiens – tentative report
  • †Dechenella
    • †Dechenella boteroi
    • †Dechenella lucasensis
  • †Decoroproetus
  • †Delicaster
    • †Delicaster enigmaticus
  • †Dellea
  • †Delthyris
    • †Delthyris clarksvillensis
  • †Deltoidospora
    • †Deltoidospora grandis
    • †Deltoidospora sphaerotriangula
  • †Dendrina – tentative report
  • †Dendrocrinus
  • †Densosporites
    • †Densosporites annulatus
    • †Densosporites irregularis
    • †Densosporites sphaerotriangularis
    • †Densosporites spinifer
    • †Densosporites triangularis
  • †Desmacriocrinus
    • †Desmacriocrinus moreyi
  • †Desmidocrinus
    • †Desmidocrinus dubius
    • †Desmidocrinus laurelianus
  • †Devonochonetes
    • †Devonochonetes coronatus
    • †Devonochonetes fragilis
    • †Devonochonetes fragilus
    • †Devonochonetes scitulus
  • †Diabolirhynchia
    • †Diabolirhynchia acinus
  • †Diabolorhynchia
    • †Diabolorhynchia acinus
  • †Diaphorodendron
  • †Diaphragmus
    • †Diaphragmus fasciculatus
  • †Dichocrinus
    • †Dichocrinus ficus
    • †Dichocrinus simplex
    • †Dichocrinus striatus
    • †Dichocrinus ulrichi
  • †Dichostreblocrinus – type locality for genus
    • †Dichostreblocrinus scrobiculus – type locality for species
  • †Dicksonites – tentative report
    • †Dicksonites pluckeneti
  • †Dicoelosia
    • †Dicoelosia bilobata
  • †Diconularia
  • †Dictyoclostus
    • †Dictyoclostus inflatus
  • †Dictyonella
    • †Dictyonella coralifera – or unidentified comparable form
    • †Dictyonella reticulata
  • †Dictyonema
  • †Dictyospongia – tentative report
  • †Diedrorynchus
    • †Diedrorynchus conalatum
  • †Dielasma
    • †Dielasma arkansana
    • †Dielasma crawfordsvillensis
    • †Dielasma crowfordsvillensis
    • †Dielasma illinoisense
  • †Dielasmella
    • †Dielasmella compressa
  • †Diestoceras
    • †Diestoceras cyrtocerinoides
    • †Diestoceras eos
    • †Diestoceras indianense
    • †Diestoceras pupa
    • †Diestoceras reversum – tentative report
    • †Diestoceras shideleri
    • †Diestoceras shiderleri
    • †Diestoceras vasiforme
    • †Diestoceras waynesvillense – type locality for species
  • †Dimegelasma
  • †Dimerocrinites
    • †Dimerocrinites carleyi
    • †Dimerocrinites inornatus
    • †Dimerocrinites occidentalis
  • Mounted skull of the Late Devonian placoderm fish Dunkleosteus
    †Dinicthys
  • †Dinobolus
    • †Dinobolus conradi – or unidentified comparable form
  • †Diplochone
    • †Diplochone greenei
  • †Diplothmema
    • †Diplothmema obtusiloba
  • †Diplotrypa
    • †Diplotrypa nummiformis
  • †Disphyllum
    • †Disphyllum cohaerens
    • †Disphyllum synaptophylloides – type locality for species
  • †Ditoecholasma
    • †Ditoecholasma acutiannulatum
  • Fossils of the Carboniferous crinoid ("sea lily") Dizygocrinus
    †Dizygocrinus
    • †Dizygocrinus indianaensis
    • †Dizygocrinus indianensis
    • †Dizygocrinus venustus – or unidentified comparable form
    • †Dizygocrinus whitei – or unidentified comparable form
  • †Dolatocrinus
    • †Dolatocrinus bellarugosus
    • †Dolatocrinus bulbaceus
    • †Dolatocrinus corporosus
    • †Dolatocrinus greeni
  • †Dolerorthis
    • †Dolerorthis flabellites
    • †Dolerorthis interplicata
  • †Dorycrinus
    • †Dorycrinus gouldi
  • †Douvillina
    • †Douvillina inaequistriata
  • †Drabia – tentative report
  • Fossil of the Silurian-Late Devonian eurypterid ("sea scorpion") Drepanopterus
    †Drepanopterus
  • †Drymopora
    • †Drymopora fascicularis
    • †Drymopora frutectosa
    • †Drymopora jacksoni
    • †Drymopora procumbens
  • †Duncanella
    • †Duncanella borealis
  • †Dyscritella
  • †Dystactospongia
    • †Dystactospongia madisonensis

E
  • †Ecclimadictyon
    • †Ecclimadictyon fastigiatum – or unidentified comparable form
  • †Echinoconchus
    • †Echinoconchus alternatus
    • †Echinoconchus biseriatus
  • †Edaphophyllum
    • †Edaphophyllum bifurcatum
    • †Edaphophyllum bipartitum
  • Life restoration of the Late Devonian-Carboniferous Chimaera relative Edestus
    †Edestus
    • †Edestus heinrichi
  • †Edmondia
    • †Edmondia varsoviensis
  • †Elasmonema
    • †Elasmonema bellatula
  • †Elaterites
    • †Elaterites triferens
  • †Eldredgeops
    • †Eldredgeops rana
  • †Elita
    • †Elita fimbriata
  • †Elvinia
  • †Elytron
    • †Elytron elimatus
  • †Emmonsia
    • †Emmonsia amplissima
    • †Emmonsia bacula
    • †Emmonsia convexa
    • †Emmonsia cymosa
    • †Emmonsia emmonsi
    • †Emmonsia epidermata
    • †Emmonsia eximia
    • †Emmonsia radiciformis
    • †Emmonsia ramosa
    • †Emmonsia tuberosa
  • †Emperocrinus
    • †Emperocrinus indianensis
  • Fossil of the Middle Ordovician-Early Devonian trilobite Encrinurus
    †Encrinurus
    • †Encrinurus indianaensis
  • †Endosporites
    • †Endosporites globiformis
    • †Endosporites plicatus
  • †Enterolasma
    • †Enterolasma caliculum
  • †Eocaudia
  • Eocaudina
    • †Eocaudina marginata
    • †Eocaudina mccormacki
  • †Eochonetes
    • †Eochonetes clarksvillensis
  • †Eodictyonella
  • †Eohalysiocrinus
    • †Eohalysiocrinus stigmatus
  • †Eoparisocrinus
    • †Eoparisocrinus siluricus
  • †Eoplectodonta
    • †Eoplectodonta prolongatus
    • †Eoplectodonta transversalis
  • †Eoplicanoplia
  • †Eospinatrypa
    • †Eospinatrypa nodostriata
  • †Eospirifer
    • †Eospirifer eudora
    • †Eospirifer foggi
    • †Eospirifer niagarensis
    • †Eospirifer radiatus
  • †Eotomaria
    • †Eotomaria laphami
    • †Eotomaria trochoides – type locality for species
  • †Eotrochus
    • †Eotrochus tenuimarginatus – type locality for species
  • †Eratocrinus
    • †Eratocrinus salemensis
  • Fossilized calyx and partial stem of the Carboniferous crinoid ("sea lily") Eretmocrinus
    †Eretmocrinus
    • †Eretmocrinus cassedayanus – tentative report
    • †Eretmocrinus magnificus
  • †Eridophyllum
    • †Eridophyllum apertum
    • †Eridophyllum archiaci
    • †Eridophyllum coagulatum
    • †Eridophyllum conjunctum
    • †Eridophyllum seriale
  • †Eridopora
    • †Eridopora macrostoma
  • †Eridorthis
    • †Eridorthis nicklesi
  • Fossils (figures 2-10) of the Silurian-Devonian eurypterid ("sea scorpion") Erieopterus
    †Erieopterus
    • †Erieopterus limuloides
  • †Eucalyptocrinites
    • †Eucalyptocrinites caelatus
    • †Eucalyptocrinites crassus
    • †Eucalyptocrinites tuberculatus
  • †Eucheirocrinus
    • †Eucheirocrinus indianensis
  • †Euchondria
    • †Euchondria grandis – tentative report
  • †Euconospira
    • †Euconospira conula – type locality for species
    • †Euconospira elegantula – type locality for species
  • †Eugeneodus – type locality for genus
    • †Eugeneodus richardsoni – type locality for species
  • †Eumetria
    • †Eumetria costata
    • †Eumetria marcyi
    • †Eumetria vera
    • †Eumetria verneuiliana
    • †Eumetria verneuliana
  • †Eunella
    • †Eunella harmonia
  • †Eunema
    • †Eunema helicteres
  • †Eunicites
  • †Euomphalopterus
    • †Euomphalopterus alatus
  • †Eupachycrinus
    • †Eupachycrinus boydii
  • †Eurychilina
    • †Eurychilina striatomarginata
  • †Eusphenopteris
  • †Euthyrhachis
    • †Euthyrhachis indianense
  • †Eutrophoceras

F
  • †Fabalicypris
  • †Fardenia
    • †Fardenia subplana
  • Fossil of the Late Ordovician-Permian tabulate coral Favosites
    †Favosites
    • †Favosites arbor
    • †Favosites baculus
    • †Favosites biloculi
    • †Favosites clelandi
    • †Favosites cristatus
    • †Favosites discoideus
    • †Favosites favosus
    • †Favosites forbesi
    • †Favosites forbsei
    • †Favosites goodwini
    • †Favosites hisingeri
    • †Favosites hispidus – or unidentified comparable form
    • †Favosites impeditus
    • †Favosites mundus
    • †Favosites niagarensis
    • †Favosites occidentalis
    • †Favosites patellatus – type locality for species
    • †Favosites pirum
    • †Favosites placentus
    • †Favosites proximatus
    • †Favosites quercus
    • †Favosites ramulosus
    • †Favosites rotundituba
    • †Favosites spinigerus
    • †Favosites turbinatus
  • †Fayettoceras
    • †Fayettoceras thompsoni
  • Fossil of the Middle Ordovician-Late Triassic bryozoan ("moss animal") Fenestella
    †Fenestella
    • †Fenestella burlingtonensis
    • †Fenestella cestriensis
    • †Fenestella exigua
    • †Fenestella matheri
  • †Fenestralia
  • †Ferganella
  • †Fimbrispirifer
    • †Fimbrispirifer divaricatus
    • †Fimbrispirifer venustus
  • †Finitiporus
    • †Finitiporus boardmani
  • †Fistulipora
    • †Fistulipora compressa
    • †Fistulipora compressus
    • †Fistulipora excellens
    • †Fistulipora incrustans
    • †Fistulipora perdensa
    • †Fistulipora promiscua
    • †Fistulipora spergenensis
  • †Fletcheria
  • †Flexaria
    • †Flexaria annosa – or unidentified related form
    • †Flexaria floydensis
  • Front (left) and right side (right) views of an enrolled fossil of the Middle Ordovician-Silurian trilobite Flexicalymene
    †Flexicalymene
    • †Flexicalymene meeki
  • †Florinites
    • †Florinites antiquus
    • †Florinites millotti
    • †Florinites similis
    • †Florinites visendus
    • †Florinites volans
  • †Floweria
    • †Floweria chemungensis

G
  • †Gattendorfia
    • †Gattendorfia alteri – type locality for species
  • †Gazacrinus
    • †Gazacrinus depressus
    • †Gazacrinus inornatus
    • †Gazacrinus magnus
    • †Gazacrinus ventricosus
  • †Gennaeocrinus
    • †Gennaeocrinus carinatus
  • †Gigantopteris
    • †Gigantopteris dawsoni
  • Fossilized calyx and partial stem of the Devonian-Carboniferous crinoid ("sea lily") Gilbertsocrinus
    †Gilbertsocrinus
    • †Gilbertsocrinus tuberosus
  • †Gilliodus
    • †Gilliodus orvillei – type locality for species
    • †Gilliodus peyeri – type locality for species
  • †Girtyella
    • †Girtyella brevilobata
    • †Girtyella indianensis
  • †Girtyspira
    • †Girtyspira canaliculata – type locality for species
  • †Gissocrinus
  • †Glabrocingulum
  • Life restoration of the Carboniferous shark Glikmanius
    †Glikmanius
    • †Glikmanius occidentalis
  • Glomospira
    • †Glomospira articulosa
  • †Glyphodeta
    • †Glyphodeta terebriformis – type locality for species
  • †Glyptambon
    • †Glyptambon verrucosus
  • †Glyptaster
  • †Glyptocrinus
  • †Glyptodesma
  • †Glyptopora
  • †Glyptorthis
    • †Glyptorthis insculpta
  • Diagram depicting the restored internal anatomy and multiple views of the shell of the Silurian nautiloid cephalopod Gomphoceras
    †Gomphoceras
    • †Gomphoceras projectum
    • †Gomphoceras wabashense
  • †Gomphocystites
    • †Gomphocystites indianensis
  • †Gorbyoceras
    • †Gorbyoceras crossi
    • †Gorbyoceras duncanae
    • †Gorbyoceras gorbyi
    • †Gorbyoceras hammelli
  • †Gosseletina
    • †Gosseletina subglobosa – type locality for species
  • †Granasporites
    • †Granasporites medius
  • †Granatocrinus
    • †Granatocrinus granulosus – tentative report
  • †Granulatisporites
    • †Granulatisporites granularis
    • †Granulatisporites minutus
    • †Granulatisporites pallidus
    • †Granulatisporites parvus – or unidentified comparable form
    • †Granulatisporites tuberculatus
  • †Graphiadactyllis
    • †Graphiadactyllis fayettevillensis
    • †Graphiadactyllis fernglenesis
    • †Graphiadactyllis granopunctatus
  • †Graphiadactylloides
    • †Graphiadactylloides imopmemsos
    • †Graphiadactylloides lineatus – or unidentified related form
    • †Graphiadactylloides moridgei
    • †Graphiadactylloides unionensis
  • †Graphiadactylus
  • †Graphosterigma
    • †Graphosterigma grammodes
  • †Graptodictya
  • †Greenops
    • †Greenops chilmanae
    • †Greenops pleione
  • Multiple views of a fossil of the Ordovician horn coral Grewingkia
    †Grewingkia
    • †Grewingkia canadensis
    • †Grewingkia rusticum
  • †Griffithidella
    • †Griffithidella doris
    • †Griffithidella welleri
  • †Gypidula
    • †Gypidula nucleus

H
  • †Hadroblastus
  • †Hadrophyllum
    • †Hadrophyllum nettelrothi
    • †Hadrophyllum orbignyi
  • Fossil of the Ordovician bryozoan ("moss animal") Hallopora
    †Hallopora
    • †Hallopora elegantula
    • †Hallopora subnodosa
  • †Halysiocrinus
    • †Halysiocrinus tunicatus
  • †Halysites
    • †Halysites catenularia
    • †Halysites labyrinthicus
    • †Halysites microporus
  • †Hamburgia
  • †Haplistion
    • †Haplistion armstrongi
  • †Hapsiphyllum
    • †Hapsiphyllum cassedayi
  • †Harpidella
    • †Harpidella christyi
  • †Harpidium – tentative report
  • †Healdia
  • †Hebertella
    • †Hebertella alveata
    • †Hebertella occidentalis
    • †Hebertella sinuata
    • †Hebertella subjugata
  • †Hedeina
    • †Hedeina eudora
  • †Hederella
    • †Hederella alpenensis
    • †Hederella delicatula
    • †Hederella filiformis
    • †Hederella thedfordensis
  • †Helicotoma
    • †Helicotoma marginata
  • †Heliolites
    • †Heliolites megastoma
  • Fossil of the Middle Devonian horn coral Heliophyllum
    †Heliophyllum
    • †Heliophyllum agassizi
    • †Heliophyllum denticulatum
    • †Heliophyllum halli
    • †Heliophyllum incrassatum
    • †Heliophyllum latericrescens
    • †Heliophyllum venatum
    • †Heliophyllum verticale
  • †Helodus
    • †Helodus incisus
  • †Helopora
    • †Helopora inexpectata
  • †Hemitrypa
  • †Hennigopora
    • †Hennigopora apta
  • †Heslerodus
    • †Heslerodus divergens
  • †Hesperorthis
  • †Heteralosia
    • †Heteralosia keokuk
  • †Heterangium
  • †Heterophrentis
    • †Heterophrentis annulata
    • †Heterophrentis cyathiformis
    • †Heterophrentis duplicata
    • †Heterophrentis inflata
    • †Heterophrentis irregularis
    • †Heterophrentis nitida – tentative report
    • †Heterophrentis ovalis
    • †Heterophrentis prolifica
    • †Heterophrentis rafinesqui
    • †Heterophrentis simplex
    • †Heterophrentis trisutura
  • †Heterotrypa
    • †Heterotrypa microstigma
    • †Heterotrypa perplexa
    • †Heterotrypa prolifica
    • †Heterotrypa singularis
    • †Heterotrypa subramosa
  • Fossil of the Devonian colonial rugose coral Hexagonaria, also known as a Petoskey stone
    †Hexagonaria
    • †Hexagonaria bella
    • †Hexagonaria cincta
    • †Hexagonaria curta
    • †Hexagonaria ovoidea
    • †Hexagonaria partita
    • †Hexagonaria ponderosa
    • †Hexagonaria prisma
  • †Hexameroceras
    • †Hexameroceras cacabiforme
    • †Hexameroceras delphicolum
  • †Hindella – tentative report
  • †Hindia
  • †Hippocardia
    • †Hippocardia ohioense
  • †Hirneacrinus
    • †Hirneacrinus cupellaeformis – type locality for species
    • †Hirneacrinus perplanus – type locality for species
  • †Hiscobeccus
    • †Hiscobeccus capax
  • †Histocrinus
    • †Histocrinus coreyi
    • †Histocrinus grandis
    • †Histocrinus graphicus
  • †Hizemodendron
    • †Hizemodendron serratum
  • †Hoareicardia
    • †Hoareicardia cunea
  • †Holcocrinus
    • †Holcocrinus nodobrachiatus
  • †Holcospermum
  • †Holocystites
    • †Holocystites abnormalis
    • †Holocystites abnormis
    • †Holocystites alternatus
    • †Holocystites clavus
    • †Holocystites faberi – or unidentified comparable form
    • †Holocystites ornatus
    • †Holocystites ovatus
    • †Holocystites parvulus
    • †Holocystites perlongus
    • †Holocystites scutellatus
    • †Holocystites spangleri
    • †Holocystites splendens
  • Fossilized shells of the Ordovician-Carboniferous sea snail Holopea
    †Holopea
    • †Holopea ampla
  • †Holtedahlina
    • †Holtedahlina sulcata
  • †Homalophyllum
    • †Homalophyllum fusiformis
    • †Homalophyllum herzeri
    • †Homalophyllum ungulum
  • †Homocrinus
  • †Homoeospira
    • †Homoeospira evax
  • †Homotrypa
    • †Homotrypa alta – or unidentified related form
    • †Homotrypa austini – or unidentified comparable form
    • †Homotrypa communis
    • †Homotrypa flabellaris
    • †Homotrypa gelasinosa
    • †Homotrypa nodulosa – or unidentified comparable form
    • †Homotrypa richmondensis
    • †Homotrypa wortheni
  • †Homotrypella
  • †Hondichnus
    • †Hondichnus monroensis
  • †Hormotoma
    • †Hormotoma gracilis
  • †Howellella
    • †Howellella crispa
    • †Howellella crispus
  • †Hydnoangulus – type locality for genus
    • †Hydnoangulus quadratus – type locality for species
  • †Hydriodictya – tentative report
    • †Hydriodictya cyclix
  • †Hylodecrinus
    • †Hylodecrinus sculptus
Fossilized shells of the Cambrian-Permian brachiopod relative Hyolitha

†Hyolithes

    • †Hyolithes monroensis
  • Hyperammina
    • †Hyperammina bulbosa
    • †Hyperammina casteri
    • †Hyperammina constricta
    • †Hyperammina gracilenta
    • †Hyperammina kentuckyensis
    • †Hyperammina rockfordensis
  • †Hypergonia
    • †Hypergonia attenuata – type locality for species
    • †Hypergonia turritella – type locality for species
    • †Hypergonia vermicula – type locality for species
  • †Hypselocrinus
    • †Hypselocrinus hoveyi
    • †Hypselocrinus indianensis

I
  • †Ichthyorachis
  • †Icriodus
    • †Icriodus latericrescens
  • †Icthyocrinus
    • †Icthyocrinus corbis
    • †Icthyocrinus subangularis
  • †Ildraites
    • †Ildraites howelli
  • †Illaenoides
  • †Illaenus
  • †Imbrexia
    • †Imbrexia forbesi
    • †Imbrexia montgomeryensis
    • †Imbrexia mortonana
  • †Imitoceras
    • †Imitoceras rotatorium
  • †Iniopera – type locality for genus
    • †Iniopera richardsoni – type locality for species
  • Life restoration of the Carboniferous Chimaera relative Iniopteryx
    †Iniopteryx
    • †Iniopteryx rushlaui
  • †Inocaulis
  • †Intrapora
    • †Intrapora irregularis
  • †Iocrinus
  • †Ischadites
    • †Ischadites subturbinatus
    • †Ischadites tenuis
  • †Ischyrodonta
    • †Ischyrodonta decipiens
    • †Ischyrodonta ovalis
    • †Ischyrodonta truncata
  • †Isobuthus
    • †Isobuthus pottsvillensis – type locality for species
  • †Isochilina
    • †Isochilina subnodosa
  • †Isorthis
    • †Isorthis arcuaria – or unidentified related form
  • Fossil of the Middle-Late Ordovician giant trilobite Isotelus.
    †Isotelus
    • †Isotelus gigas
    • †Isotelus maximus

K
  • †Kallimorphocrinus – type locality for genus
    • †Kallimorphocrinus astrus – type locality for species
  • †Kalymma
    • †Kalymma lirata
  • †Karinopteris
  • †Kaskia
    • †Kaskia chesterensis
  • †Kindbladia
  • †Kindleoceras
    • †Kindleoceras cumingsi
    • †Kindleoceras equilaterale
    • †Kindleoceras rotundum
  • †Kingstonia
  • †Kionelasma
    • †Kionelasma coarticum
    • †Kionelasma conspicuum
    • †Kionelasma mammiferum
  • Fossilized shells of the Middle Ordovician-Permian nautiloid cephalopod Kionoceras
    †Kionoceras
    • †Kionoceras bellense – or unidentified comparable form
    • †Kionoceras cancellatum
    • †Kionoceras delphiense
  • †Kirkbya
    • †Kirkbya fernglenensis
    • †Kirkbya keiferi
  • †Kirkbyella
    • †Kirkbyella annensis
  • †Kirkidium
    • †Kirkidium knighti – or unidentified comparable form
    • †Kirkidium laqueatum
  • †Knightites
  • †Knoxina
  • †Knoxisporites
    • †Knoxisporites rotatus
    • †Knoxisporites triradiatus
  • †Kodonophyllum
    • †Kodonophyllum mulleri – or unidentified comparable form
  • Life restoration of the Silurian eurypterid ("sea scorpion") Kokomopterus
    †Kokomopterus
    • †Kokomopterus longicaudatus
  • †Kosovopeltis

L
  • †Labechia
  • †Laevigatosporites
    • †Laevigatosporites desmoinensis
    • †Laevigatosporites desmoinesensis
    • †Laevigatosporites globosus
    • †Laevigatosporites medius
    • †Laevigatosporites minutus
    • †Laevigatosporites ovalis
    • †Laevigatosporites punctatus
    • †Laevigatosporites vulgaris
  • †Lambeoceras
    • †Lambeoceras richmondense
  • †Lampadosocrinus
    • †Lampadosocrinus minutus
  • †Langepis
    • †Langepis campbelli – type locality for species
  • †Laurelocrinus
    • †Laurelocrinus gibbosus
    • †Laurelocrinus paulensis
    • †Laurelocrinus spinoradialis
    • †Laurelocrinus wilsoni
  • †Leangella
  • †Lebedictya
    • †Lebedictya crinita
  • †Lebetocrinus
    • †Lebetocrinus grandis
  • †Lecanocrinus
    • †Lecanocrinus elongatus
    • †Lecanocrinus pusillus
  • †Lechritochoceras
    • †Lechritochoceras desplainense
  • †Lecythiocrinus – tentative report
  • †Leiorhynchus
    • †Leiorhynchus limitare
    • †Leiorhynchus quadricostatum
  • †Leiotriletes
    • †Leiotriletes adnatoides
    • †Leiotriletes levis
    • †Leiotriletes notatus
  • †Leodicites
    • †Leodicites imparilis – or unidentified related form
    • †Leodicites variedentatus
  • †Lepadocystis
  • †Leperditia
    • †Leperditia caecigena
    • †Leperditia caecigenia
  • †Lepetopsis
    • †Lepetopsis levettei – type locality for species
  • †Lepidocarpon
  • †Lepidocyclus
    • †Lepidocyclus perlamellosum
  • Restoration of the Carboniferous-Late Triassic club moss relative Lepidodendron. Eli Heimans (1911).
    †Lepidodendron
    • †Lepidodendron aculeatum
    • †Lepidodendron baylense
    • †Lepidodendron dichotomum
    • †Lepidodendron hickii
    • †Lepidodendron lanceolatum – tentative report
    • †Lepidodendron latifolium
    • †Lepidodendron modulatum
    • †Lepidodendron obovatum
    • †Lepidodendron ophiurus
    • †Lepidodendron vestitum
    • †Lepidodendron wortheni
  • †Lepidophloios
    • †Lepidophloios hallii
    • †Lepidophloios laricinus – or unidentified comparable form
  • †Lepidophyllum
    • †Lepidophyllum longifolium
  • †Lepidostrobophyllum
    • †Lepidostrobophyllum affine
    • †Lepidostrobophyllum ovatifolius
    • †Lepidostrobophyllum princeps – or unidentified comparable form
  • †Lepidostrobus
    • †Lepidostrobus incertus – or unidentified comparable form
    • †Lepidostrobus variabilis
  • †Leptaena
    • †Leptaena convexa
    • †Leptaena gibbosa
    • †Leptaena rhomboidalis
    • †Leptaena richmondensis
  • †Leptoconocardium
    • †Leptoconocardium catastomum – type locality for species
  • †Leptodesma
    • †Leptodesma rogersi
  • †Leptotrypella
    • †Leptotrypella ohioensis
  • †Lesueurilla
    • †Lesueurilla beloitensis
  • †Lichas
    • †Lichas breviceps
  • †Lichenalia
  • †Liljevallospira
  • †Limoptera
  • Shell of the Cambrian-modern brachiopod Lingula
    †Lingula
    • †Lingula otheri
    • †Lingula spatulata
  • †Lingulops
  • †Linoproductus
    • †Linoproductus altonensis
    • †Linoproductus pileiformis
  • †Linopteris
  • †Liospira
    • †Liospira micula
    • †Liospira obtusa
    • †Liospira vitruvia
  • †Lissatrypa
  • †Litocrinus
  • †Llanoaspis – tentative report
  • †Lobatopteris
    • †Lobatopteris vestita – or unidentified comparable form
  • †Lobomelocrinus
    • †Lobomelocrinus obconicus
  • †Lophoblastus
    • †Lophoblastus inopinatus – or unidentified comparable form
  • †Lophospira
    • †Lophospira milleri
    • †Lophospira perangulata
    • †Lophospira serrulata
    • †Lophospira ventricosa
  • †Lophotriletes
    • †Lophotriletes commissuralis
    • †Lophotriletes pseudaculeatus
    • †Lophotriletes rarispinosus
  • †Loxonema
  • †Lumbriconerites
  • †Lumectaster
    • †Lumectaster howelli
  • †Lunulazona – tentative report
    • †Lunulazona springeri
  • †Lycospora
    • †Lycospora granulata
    • †Lycospora micropapillata
    • †Lycospora noctuina
    • †Lycospora orbicula
    • †Lycospora paulula
    • †Lycospora pellucida
    • †Lycospora punctata
    • †Lycospora pusilla
    • †Lycospora rotunda
    • †Lycospora subjuga
  • †Lyginorachis
    • †Lyginorachis dineuroides
  • †Lyriocrinus
    • †Lyriocrinus melissa
  • †Lyrodesma
    • †Lyrodesma major
  • †Lyropora
    • †Lyropora devonica
  • †Lyroporella
    • †Lyroporella divergens
  • †Lysocystites
    • †Lysocystites sculptus
  • †Lytospira
    • †Lytospira undulatus

M
  • †Macrocrinus
    • †Macrocrinus mundulus – tentative report
    • †Macrocrinus strotobasilaris
    • †Macrocrinus strotobasilarsis
  • Macrocypris – tentative report
  • †Macrostachya
    • †Macrostachya infundibuliformis
  • †Macrostylocrinus
    • †Macrostylocrinus fasciatus
    • †Macrostylocrinus striatus
  • †Manicrinus
    • †Manicrinus erectus
    • †Manicrinus hybocriniformis
  • †Manitoulinoceras
    • †Manitoulinoceras erraticum
    • †Manitoulinoceras gyroforme
    • †Manitoulinoceras moderatum
  • †Marginatia
    • †Marginatia burlingtonensis
    • †Marginatia crawfordsvillensis
  • †Marginirugus
    • †Marginirugus magnus
  • †Mariopteris
    • †Mariopteris hymenophylloides – tentative report
    • †Mariopteris mazoniana
    • †Mariopteris muricata
    • †Mariopteris nervosa
  • †Marsupiocrinus
    • †Marsupiocrinus laurelensis
    • †Marsupiocrinus pauciornatus
    • †Marsupiocrinus turbinatus
  • †Martinia
    • †Martinia contracta
  • †Maurotarion
    • †Maurotarion christi
  • †Mediospirifer
    • †Mediospirifer audaculus
  • †Medullosa
  • †Meekopora
    • †Meekopora eximia
  • †Megakozlowskiella
    • †Megakozlowskiella sculptilis
  • †Megalomphala
    • †Megalomphala crassa
  • †Megalomus
    • †Megalomus canadensis
  • †Megastrophia
    • †Megastrophia concava
    • †Megastrophia profunda
  • †Megistocrinus
    • †Megistocrinus expansus
  • †Melocrinites
    • †Melocrinites aequalis
    • †Melocrinites oblongus
  • †Melonechinus
  • †Mendacella
    • †Mendacella circulus
  • †Meniscophyllum
    • †Meniscophyllum minutum
  • †Menoeidina
  • †Merista
    • †Merista nitida
  • Illustration (lower right, entry 15) of a fossilized shell in front and side views of the Silurian-Late Devonian brachiopod Meristella
    †Meristella
    • †Meristella nasuta
  • †Meristina
    • †Meristina maria
    • †Meristina rectirostra
    • †Meristina rectirostris
  • †Merocanites
  • †Mesocyridira
    • †Mesocyridira bifurcata
    • †Mesocyridira flagrocosta
    • †Mesocyridira keokuk
    • †Mesocyridira pallaensis – or unidentified related form
    • †Mesocyridira pellaensis – or unidentified related form
    • †Mesocyridira washingtonensis
  • †Mesoleptostrophia
  • †Mesoneuron
    • †Mesoneuron simplex
  • †Mesotrypa
  • †Metriophyllum
    • †Metriophyllum deminutivum
  • †Miamoceras
    • †Miamoceras shideleri
  • †Michelinia
    • †Michelinia manucus
  • †Microantyx
    • †Microantyx botoni – type locality for species
  • †Microcheilinella
    • †Microcheilinella spinosa
  • †Microplasma
  • †Microreticulatisporites
    • †Microreticulatisporites nobilis
    • †Microreticulatisporites sulcatus
  • †Mirocheilinella
  • †Mixoneura – tentative report
    • †Mixoneura jenneyi
  • †Modiolopsis
    • †Modiolopsis concentrica – tentative report
    • †Modiolopsis modiolaris
    • †Modiolopsis versaillesensis
  • †Modiomorpha
    • †Modiomorpha concentrica
  • †Monodechenella
    • †Monodechenella macrocephala
  • †Monomorella
  • †Monotrypa
    • †Monotrypa benjamini
    • †Monotrypa exserta
  • †Monotrypella
    • †Monotrypella aequalis
  • †Mooreisporites
    • †Mooreisporites inusitatus
  • †Mooreoceras
    • †Mooreoceras chouteauense
    • †Mooreoceras indianense
  • †Mourlonia
  • †Mucophyllum
  • Fossilized shell of the Devonian brachiopod Mucrospirifer
    †Mucrospirifer
    • †Mucrospirifer mucronatus
    • †Mucrospirifer profundus
    • †Mucrospirifer prolificus
  • †Muensteroceras
    • †Muensteroceras oweni
    • †Muensteroceras parallelum
  • †Mulceodens
    • †Mulceodens jaanussoni – or unidentified comparable form
  • †Murchisonia
    • †Murchisonia laphami
    • †Murchisonia subulata
    • †Murchisonia vincta – type locality for species
  • †Murchisonida
  • †Myalina
    • †Myalina keokuk
  • †Myelodactylus
    • †Myelodactylus ammonis
    • †Myelodactylus convolutus
  • †Mysticocrinus

N
  • †Natica
    • †Natica littonana – type locality for species
  • †Naticonema
  • Fossilized shell of the Early Devonian – Triassic sea snail Naticopsis
    †Naticopsis
    • †Naticopsis carleyana – type locality for species
    • †Naticopsis plebeia
  • †Navispira
    • †Navispira kennethensis
  • †Neilsonia
    • †Neilsonia insculpta – type locality for species
  • †Nematopora
  • †Neolageniocrinus
    • †Neolageniocrinus cassidus – type locality for species
  • †Neopalaeaster
    • †Neopalaeaster crawfordsvillensis
  • †Neozaphrentis
  • †Nereidavis
  • Fossilized frond of the Carboniferous seed fern Neuropteris
    †Neuropteris
    • †Neuropteris fimbriata
    • †Neuropteris flexuosa
    • †Neuropteris heterophylla
    • †Neuropteris macrophylla
    • †Neuropteris obliqua
    • †Neuropteris ovata
    • †Neuropteris rarinervis
    • †Neuropteris scheuchzeri
    • †Neuropteris tenuifolia
    • †Neuropteris violetta
  • †Nicklesopora
  • †Nikiforovella
  • †Nipterocrinus
    • †Nipterocrinus monroensis
  • †Nucleocrinus
    • †Nucleocrinus angularis
  • †Nucleospira
    • †Nucleospira concentrica – or unidentified comparable form
    • †Nucleospira concinna
    • †Nucleospira pisiformis
    • †Nucleospira rowleyi – or unidentified related form
  • †Nucularca
    • †Nucularca cingulata
  • †Nuculites
  • †Nuculopsis
    • †Nuculopsis hians

O
  • †Odontophyllum
    • †Odontophyllum convergens
  • Restoration of the Late Ordovician-Middle Devonian trilobite Odontopleura
    †Odontopleura – tentative report
  • †Odontopteris
    • †Odontopteris subcuneata
  • †Ohiocrinus
    • †Ohiocrinus brauni
  • †Oligocarpia
    • †Oligocarpia missouriensis
  • †Omospira
    • †Omospira alexandra – or unidentified comparable form
  • †Omphalophloios[1]
    • †Omphalophloios wagneri – type locality for species[1]
  • †Oncoceras
    • †Oncoceras anomalum
    • †Oncoceras duncanae
    • †Oncoceras exile
    • †Oncoceras insuetum
  • †Onniella
    • †Onniella macerata
  • †Onychaster
    • †Onychaster flexilis
  • Fossil of the Carboniferous crinoid ("sea lily") Onychocrinus
    †Onychocrinus
    • †Onychocrinus exculptus
    • †Onychocrinus exsculptus
    • †Onychocrinus pulaskiensis
    • †Onychocrinus ramulosus
  • †Onychopterella
    • †Onychopterella kokomoensis
  • †Oonoceras
    • †Oonoceras fennemani
    • †Oonoceras rejuvenatum
    • †Oonoceras shideleri
  • †Ophiletina
    • †Ophiletina sublaxa
  • †Opisthoptera
    • †Opisthoptera casei
  • †Orbiculoidea
    • †Orbiculoidea keokuk
    • †Orbiculoidea lodiensis
  • †Oriostoma
    • †Oriostoma globosum – or unidentified comparable form
    • †Oriostoma hoyi
  • †Ornithoprion – type locality for genus
    • †Ornithoprion hertwigi – type locality for species
  • Restoration of the Carboniferous-Permian cartilaginous fish Orodus
    †Orodus
    • †Orodus greggi – type locality for species
    • †Orodus micropterygius – type locality for species
  • †Orthis
    • †Orthis biforata
    • †Orthis pyramidalis
  • †Orthodesma
    • †Orthodesma curvatum
  • †Orthonybyoceras
    • †Orthonybyoceras dyeri
  • †Orthonychia
    • †Orthonychia conicum
  • †Orthopleura
  • †Orthostrophia
    • †Orthostrophia fissistriata
  • †Orthotetes
    • †Orthotetes kaskaskiensis
    • †Orthotetes keokuk
  • †Ortonella
    • †Ortonella hainesi
  • †Osgoodicystis
    • †Osgoodicystis biessetti
    • †Osgoodicystis cooperi
    • †Osgoodicystis wykoffi
  • †Otarion
    • †Otarion niagarensis
  • †Ovatia
    • †Ovatia ovata – tentative report
    • †Ovatia ovatus
  • †Oxyprora
    • †Oxyprora carinatum – type locality for species

P
  • †Pachydictya
    • †Pachydictya crassa
  • †Pachylocrinus
    • †Pachylocrinus aequalis
    • †Pachylocrinus briareus
    • †Pachylocrinus gibsoni
  • †Pachytesta
    • †Pachytesta vera – or unidentified comparable form
  • †Palaeacis
    • †Palaeacis enormis
  • †Palaeocapulus
    • †Palaeocapulus acutirostre
    • †Palaeocapulus equilateralis
  • †Palaeoconcha
    • †Palaeoconcha faberi
  • †Palaeoneilo
    • †Palaeoneilo sulcatina
    • †Palaeoneilo truncata
  • †Palaeostachya
    • †Palaeostachya elongata
  • †Paleofavosites – tentative report
    • †Paleofavosites prolificus
  • †Paleospora
    • †Paleospora fragila
  • †Paleostachya
  • †Paliphyllum
    • †Paliphyllum suecicum brassfieldense
  • †Palmatolepis
    • †Palmatolepis linguiformis
    • †Palmatolepis pseudofoliatus
    • †Palmatolepis timorenis
  • †Palmatopteris
    • †Palmatopteris furcata
  • †Paolia – type locality for genus
    • †Paolia vetusta – type locality for species
  • †Paoliola
    • †Paoliola gurleyi – type locality for species
  • †Paracolocrinus
    • †Paracolocrinus paradoxicus
  • †Paraconularia
    • †Paraconularia chesterensis – tentative report
    • †Paraconularia crawfordsvillensis
  • †Paracyclas
    • †Paracyclas occidentalis
    • †Paracyclas proavia
  • †Paradichocrinus
    • †Paradichocrinus planus
    • †Paradichocrinus polydactylus
  • †Paragazacrinus
    • †Paragazacrinus rotundus
  • †Parallelodon
    • †Parallelodon obsoletus – tentative report
    • †Parallelodon tenuistriatus
  • †Paralycopodites
    • †Paralycopodites brevifolius
  • †Paraparchites
  • Assemblage of the Early-Middle Devonian brachiopod Paraspirifer
    †Paraspirifer
    • †Paraspirifer acuminatus
  • †Parazyga
    • †Parazyga hirsuta
  • †Parichthyocrinus
    • †Parichthyocrinus crawfordsvillensis
    • †Parichthyocrinus meeki
  • †Parisocrinus
    • †Parisocrinus crawfordsvillensis
  • †Parvohallopora
    • †Parvohallopora ramosa
  • †Passalocrinus
    • †Passalocrinus triangularis
  • †Patelliocrinus
    • †Patelliocrinus indianensis
    • †Patelliocrinus laevis
    • †Patelliocrinus ornatus
    • †Patelliocrinus rugosus
  • †Paulicystis
    • †Paulicystis densus
    • †Paulicystis sparsus
  • †Paulocrinus
    • †Paulocrinus biturbinatus
  • †Paupospira
    • †Paupospira bowdeni
    • †Paupospira moorei – type locality for species
    • †Paupospira tropidophora
  • Fossils of the Late Devonian-Permian fern-like fronds Pecopteris
    †Pecopteris
    • †Pecopteris cisti
    • †Pecopteris clintoni
    • †Pecopteris miltonii
    • †Pecopteris polymorpha
    • †Pecopteris pseudovestita – tentative report
    • †Pecopteris serpillifolia – tentative report
    • †Pecopteris squamosa
  • †Pelagiella
  • †Pellecrinus
    • †Pellecrinus hexadactylus
  • †Pemtremites
    • †Pemtremites patei
  • †Penniretepora
  • †Pennsylvanioxylon
    • †Pennsylvanioxylon nauertianum
  • †Pentacystis
    • †Pentacystis gibsoni
    • †Pentacystis wykoffi
  • †Pentagonia
    • †Pentagonia biplicata
  • †Pentamerella
    • †Pentamerella arata
    • †Pentamerella pavilionensis
  • †Pentameroceras
    • †Pentameroceras cumingsi
  • †Pentamerus
    • †Pentamerus fornicata
    • †Pentamerus oblungus
  • †Pentaramicrinus
    • †Pentaramicrinus bimagnaramus
  • Fossilized theca of the Carboniferous blastoid echinoderm ("sea bud") Pentremites
    †Pentremites
    • †Pentremites abruptus
    • †Pentremites angularis
    • †Pentremites buttsi
    • †Pentremites clavatus
    • †Pentremites conoideus
    • †Pentremites elegans
    • †Pentremites girtyi
    • †Pentremites halli
    • †Pentremites hambachi
    • †Pentremites maccalliei
    • †Pentremites okawensis
    • †Pentremites patei
    • †Pentremites platybasis
    • †Pentremites pyramidatus
    • †Pentremites pyriformis
    • †Pentremites robustus
    • †Pentremites springeri
    • †Pentremites symmetricus
    • †Pentremites tulilpaformis
    • †Pentremites tulipaformis
    • †Pentremites welleri
  • †Pentremitidea – tentative report
    • †Pentremitidea approximata
  • †Perditocardinia
    • †Perditocardinia dubia
  • †Periastron
    • †Periastron perforatum
    • †Periastron reticulatum
  • †Pericyclus
  • †Periechocrinites
  • Fossil of the Silurian-Carboniferous crinoid ("sea lily") Periechocrinus
    †Periechocrinus
    • †Periechocrinus umbrosus
  • †Peronopora
    • †Peronopora decipiens
  • †Petalocrinus
    • †Petalocrinus inferior
    • †Petalocrinus longus
  • †Petigopora
  • †Petrocrania
    • †Petrocrania scabiosa
  • †Phacelocrinus
    • †Phacelocrinus longidactylus
  • Fossil of the Late Ordovician-Late Devonian trilobite Phacops
    †Phacops
  • †Phaenopora
    • †Phaenopora ensiformis
  • †Phaenoschisma
  • †Phanocrinus
    • †Phanocrinus formosus
    • †Phanocrinus parvaramus
  • †Phestia
  • †Philhedra
    • †Philhedra crenistriata
    • †Philhedra laelia
    • †Philhedra stewarti
  • †Phillipsia
    • †Phillipsia bufi
    • †Phillipsia bufo
  • †Phimocrinus – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Pholadomorpha
    • †Pholadomorpha pholadiformis
  • †Pholidops – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Pholidostrophia
    • †Pholidostrophia iowaensis
  • †Phosphannulus
  • †Phractopora
  • †Phragmoceras
    • †Phragmoceras parvum
  • †Phragmodictya
    • †Phragmodictya catilliforme
  • †Phragmolites
    • †Phragmolites dyeri
    • †Phragmolites triangularis
  • †Phymatophyllum
    • †Phymatophyllum multiplicatum
  • †Physospongia
    • †Physospongia colletti
    • †Physospongia dawsoni
  • †Pietzschia
    • †Pietzschia polyupsilon
  • †Pinna
    • †Pinna subspatulata
  • †Pinnularia
  • †Pisocrinus
    • †Pisocrinus benedicti – or unidentified comparable form
    • †Pisocrinus campana
    • †Pisocrinus gemmiformis
    • †Pisocrinus gorbyi
    • †Pisocrinus quinquelobus
  • Fossilized shell of the Ordovician brachiopod Plaesiomys
    †Plaesiomys
    • †Plaesiomys subquadrata
    • †Plaesiomys subquatra
  • †Planalvus – tentative report
    • †Planalvus densa
  • †Plasmopora
    • †Plasmopora follis
  • †Platyaxum
    • †Platyaxum alicornis
    • †Platyaxum foliatum
    • †Platyaxum orthosoleniskum
    • †Platyaxum undosum
  • Fossilized shell of the Silurian-Early Triassic sea snail Platyceras
    †Platyceras
    • †Platyceras argo – tentative report
    • †Platyceras brownsportense
    • †Platyceras bucculentum
    • †Platyceras clintonensis
    • †Platyceras cornutum – or unidentified comparable form
    • †Platyceras crassum
    • †Platyceras daytonense
    • †Platyceras echinatum
    • †Platyceras erectum
    • †Platyceras lineatum
    • †Platyceras niagarense
    • †Platyceras niagarensis
    • †Platyceras plebium
  • †Platycrinites
    • †Platycrinites bonoensis
    • †Platycrinites hemispericus
    • †Platycrinites hemisphericus
    • †Platycrinites nodostriatus
    • †Platycrinites saffordi
    • †Platycrinites safordi
  • †Platycrinus
  • †Platyrachella
    • †Platyrachella macbridei
    • †Platyrachella oweni
  • Fossilized shell of the Middle Ordovician-Silurian brachiopod Platystrophia
    †Platystrophia
    • †Platystrophia acutilirata
    • †Platystrophia annieana
    • †Platystrophia attenuata
    • †Platystrophia biforata – or unidentified comparable form
    • †Platystrophia clarksvillensis
    • †Platystrophia cummingsi
    • †Platystrophia cypha
    • †Platystrophia daytonensis
    • †Platystrophia elkhornensis
    • †Platystrophia foerstei
    • †Platystrophia hopensis
    • †Platystrophia laticosta
    • †Platystrophia moritura
    • †Platystrophia ponderosa
  • †Platyzona
    • †Platyzona trilineata – type locality for species
  • †Pleapopleurus
    • †Pleapopleurus tenuicostatus
    • †Pleapopleurus tenuicostus
  • †Pleapopluerus
    • †Pleapopluerus tenuicostatus – tentative report
  • †Plectatrypa
  • †Plectodonta
    • †Plectodonta elegantula
    • †Plectodonta transversalis
  • †Plectorthis
    • †Plectorthis plicatella
  • †Plectospira
    • †Plectospira sexplicata
  • †Plectospirifer
  • †Pleurocornu
    • †Pleurocornu amissum – or unidentified comparable form
  • Fossil of the Silurian-Carboniferous tabulate coral Pleurodictyum
    †Pleurodictyum
    • †Pleurodictyum cornu
    • †Pleurodictyum cylindricum
    • †Pleurodictyum insigne
    • †Pleurodictyum maximum
    • †Pleurodictyum michelinoidea
    • †Pleurodictyum papillosa
    • †Pleurodictyum planum
    • †Pleurodictyum speciosus
    • †Pleurodictyum spiculata
    • †Pleurodictyum wardi
  • †Pleuronotus
    • †Pleuronotus decewi
  • †Pleurorthoceras
    • †Pleurorthoceras clarksvillense
  • †Poleumita
    • †Poleumita scamnata
  • Various conodont elements of Polygnathus
    †Polygnathus
  • †Polypora
    • †Polypora corticosa
    • †Polypora multispinosa
    • †Polypora nodolinearis
  • †Polysacos – type locality for genus
    • †Polysacos vickersianum – type locality for species
  • †Polytryphocycloides
  • †Polyxylon
    • †Polyxylon elegans
  • †Portlockiella
  • †Poterioceras – tentative report
  • †Poteriocrinites
    • †Poteriocrinites amplus – type locality for species
  • †Potonieisporites
    • †Potonieisporites elegans
  • †Prasopora
    • †Prasopora hospitalis
  • Priscopedatus
  • †Prismopora
    • †Prismopora serrulata
  • †Pristiograptus
    • †Pristiograptus jaegeri
  • †Probillingsites
  • Proboscina
  • †Prodromites
    • †Prodromites gorbyi
  • †Productus
    • †Productus cestriensis
    • †Productus fasiculatus
  • Restoration of the Silurian trilobite Proetus
    †Proetus
    • †Proetus crassimarginatus
    • †Proetus folliceps
  • †Prolecanites
    • †Prolecanites lyoni
  • †Prolecythiocrinus
    • †Prolecythiocrinus problematicus
  • †Promexyele
    • †Promexyele bairdi
    • †Promexyele peyeri – type locality for species
  • †Propora
    • †Propora exigua
  • †Prosolarium
    • †Prosolarium crenulata
  • †Protaraea
    • †Protaraea richmondensis
  • †Protatrypa
    • †Protatrypa marginalis
  • †Proteonina
    • †Proteonina cumberlandiae
  • †Protocalamites
    • †Protocalamites dorfii
  • †Protocanites
  • †Protochonetes – tentative report
  • †Protokoinoceras
    • †Protokoinoceras medullare
  • †Protolepidodendron
    • †Protolepidodendron microphyllum
  • †Protoleptostrophia
    • †Protoleptostrophia perplana
  • †Protomegastrophia
  • †Protoniella
    • †Protoniella parva – or unidentified related form
  • †Protophragmoceras
    • †Protophragmoceras hercules
  • †Protosalvinia
    • †Protosalvinia rarenna
  • Psammosphaera
  • Life restoration of the Devonian-Permian tree fern Psaronius. Auguste Faguet (1877).
    †Psaronius
  • †Pseudagnostus
  • †Pseudastrorhiza
    • †Pseudastrorhiza conica
  • †Pseudaviculopecten
    • †Pseudaviculopecten indianensis
  • †Pseudoatrypa
    • †Pseudoatrypa devoniana
  • †Pseudobythocypris
  • †Pseudocolpomya
    • †Pseudocolpomya elongata
  • †Pseudolingula
  • †Pseudostrohiza
    • †Pseudostrohiza delicata
  • †Pseudosyrinx
    • †Pseudosyrinx gigas
  • †Pseudozygopleura
    • †Pseudozygopleura yandellana – type locality for species
  • †Psiloconcha
    • †Psiloconcha grandis
  • †Psilokirkbyella
    • †Psilokirkbyella ozarkensis
  • Interior and exterior of the shell of a Pteria, or winged oyster
    †Pteria
  • †Pterinea
    • †Pterinea brisa
    • †Pterinea demissa
  • †Pterinopecten
    • †Pterinopecten hermes
    • †Pterinopecten princeps
  • †Pterocephalia
  • †Pterotheca
    • †Pterotheca expansa
    • †Pterotheca intermedia – type locality for species
  • †Pterotocrinus
    • †Pterotocrinus acutus
    • †Pterotocrinus armatus – or unidentified comparable form
    • †Pterotocrinus bifurcatus
    • †Pterotocrinus birfurcatus
    • †Pterotocrinus convexus
    • †Pterotocrinus depressus
    • †Pterotocrinus lingulaformis
    • †Pterotocrinus rugosus
    • †Pterotocrinus spatulatus
  • Restoration of the Silurian-Middle Devonian eurypterid ("sea scorpion") Pterygotus
    †Pterygotus
    • †Pterygotus ventricosus
  • †Ptychocarpus
    • †Ptychocarpus unitus
  • †Ptychopleurella
  • †Ptylopora
  • †Punctatisporites
    • †Punctatisporites decorus
    • †Punctatisporites flavus
    • †Punctatisporites glaber
    • †Punctatisporites incomptus
    • †Punctatisporites minutus
    • †Punctatisporites nahannensis
    • †Punctatisporites obesus
    • †Punctatisporites orbicularis
  • †Punctatosporites
    • †Punctatosporites minutus
  • †Punctospirifer
    • †Punctospirifer obtusus
    • †Punctospirifer transversus
  • †Pustulocystis
    • †Pustulocystis ornatissimus
  • †Pycnosaccus
    • †Pycnosaccus laurelensis

Q
  • †Quasillinites
    • †Quasillinites diversiformis
  • †Quasillites – tentative report
  • †Quassilites

R
  • †Rafinesquina
    • †Rafinesquina alternata
    • †Rafinesquina ponderosa
  • †Raistrickia
    • †Raistrickia breveminens
    • †Raistrickia carbondalensis
    • †Raistrickia crinita
    • †Raistrickia crocea
    • †Raistrickia lowellensis
    • †Raistrickia subcrinita
    • †Raistrickia superba
  • †Raphistomina
    • †Raphistomina modesta – or unidentified comparable form
  • †Rasmussenoceras
    • †Rasmussenoceras variable
  • †Rectifenestella
    • †Rectifenestella tenax
  • †Rectobaidia
    • †Rectobaidia fragosa – or unidentified related form
  • †Reimannia
    • †Reimannia indianensis
  • †Renalcis – tentative report
  • †Renaultia
    • †Renaultia chaerophylloides
  • Reophax
    • †Reophax lachrymosa
  • †Resserella
    • †Resserella elegantula
    • †Resserella waldronensis
  • †Reticulariina
    • †Reticulariina salemensis
    • †Reticulariina spinosa
  • †Reticulatisporites
    • †Reticulatisporites polygonalis
    • †Reticulatisporites reticulatus
  • †Reticulitriletes
    • †Reticulitriletes falsus
  • †Reticulopteris
    • †Reticulopteris muensteri
  • †Retispira
    • †Retispira textilis – type locality for species
  • †Retoporina
    • †Retoporina striata
  • †Retrorsirostra
    • †Retrorsirostra carleyi
  • †Retzia
    • †Retzia raricosta
  • †Rhabdocarpus
    • †Rhabdocarpus mamillatus
    • †Rhabdocarpus mansfieldi – or unidentified comparable form
    • †Rhabdocarpus multistriatus
  • †Rhabdomeson
  • †Rhadinichthys
  • †Rhegmaphyllum – tentative report
    • †Rhegmaphyllum daytonensis
  • †Rhineoderma
    • †Rhineoderma nodulostriata – type locality for species
    • †Rhineoderma wortheni – type locality for species
  • †Rhinidictya
  • †Rhipdomella
    • †Rhipdomella perminuta
  • †Rhipidium
  • †Rhipidomella
    • †Rhipidomella hybrida
    • †Rhipidomella missouriensis
    • †Rhipidomella penelope
    • †Rhipidomella perminuta
    • †Rhipidomella tenuicosta – or unidentified comparable form
    • †Rhipidomella vanuxemi
  • †Rhipidothyris
  • †Rhombopora
    • †Rhombopora simplex
  • †Rhombotrypa
    • †Rhombotrypa quadrata
  • Fossilized shell of the Silurian-Eocene articulate brachiopod Rhynchonella
    †Rhynchonella
    • †Rhynchonella gainesi
    • †Rhynchonella scobina
    • †Rhynchonella tenuistriata
  • †Rhynchopora
    • †Rhynchopora beecheri
    • †Rhynchopora perryensis – tentative report
    • †Rhynchopora rowleyi – tentative report
  • †Rhynchotrema
    • †Rhynchotrema denatum
    • †Rhynchotrema dentatum
  • †Rhynchotreta
    • †Rhynchotreta americana
  • †Rhysocamax
    • †Rhysocamax grandis
  • †Rhytimya
    • †Rhytimya byrnesis
    • †Rhytimya mickleboroughi
  • †Richmondoceras – type locality for genus
    • †Richmondoceras brevicameratum – type locality for species
  • †Rineceras
    • †Rineceras digonum – tentative report
  • †Romingerella
    • †Romingerella major – or unidentified comparable form
  • †Romingeria
    • †Romingeria commutata
    • †Romingeria fasciculata
    • †Romingeria umbellifera
    • †Romingeria uva
  • †Ropalonaria
  • † Rota
  • †Rotiphyllum
    • †Rotiphyllum calyculum
  • †Roundyella
    • †Roundyella mopacifa
  • †Rugomena
    • †Rugomena vetusta
  • †Rugosochonetes
    • †Rugosochonetes illinoisensis
    • †Rugosochonetes planumbona

S
  • †Saccocrinus
    • †Saccocrinus benedicti
    • †Saccocrinus christyi
  • †Saccosompsis
    • †Saccosompsis poterium
  • †Saffordotaxis
  • †Salpingostoma
    • †Salpingostoma buelli
    • †Salpingostoma richmondense
  • †Samaropsis
    • †Samaropsis crampii – or unidentified comparable form
  • †Sandalodus
  • †Sanguinolites
    • †Sanguinolites herricki – tentative report
    • †Sanguinolites tropidophorus
  • †Sapphicorhynchus
    • †Sapphicorhynchus sappho
  • †Sarocrinus
    • †Sarocrinus nitidus
  • †Savitrisporites
    • †Savitrisporites nux
  • †Scalarituba
    • †Scalarituba missouriensis
  • †Scalites
    • †Scalites richmondensis
  • †Scenophyllum
    • †Scenophyllum conigerum
  • †Schellwienella
    • †Schellwienella ulrichi
  • †Schizobolus
    • †Schizobolus concentricus
  • †Schizonema – tentative report
  • †Schizophoria
  • †Schlotheimophyllum
    • †Schlotheimophyllum typicum
  • †Schoenaster
    • †Schoenaster fimbriatus
  • †Schopfites
    • †Schopfites colchesterensis
    • †Schopfites dimorphus
  • †Schuchertella
    • †Schuchertella costatula
    • †Schuchertella lens – tentative report
    • †Schuchertella subplana
  • †Schuchertoceras
    • †Schuchertoceras geniculatum
    • †Schuchertoceras prolongatum
    • †Schuchertoceras rotundum
  • †Schulzospora
    • †Schulzospora rara
  • Fossilized calyx of the Carboniferous crinoid ("sea lily") Scytalocrinus
    †Scytalocrinus
    • †Scytalocrinus decadactylus
    • †Scytalocrinus disparilis – or unidentified comparable form
    • †Scytalocrinus robustus
  • †Senftenbergia
    • †Senftenbergia pennaeformis
  • †Septopora
    • †Septopora cestriensis
    • †Septopora subquadrans
  • †Serpulopsis
    • †Serpulopsis jacobschapelensis
  • †Serpulospira
    • †Serpulospira planispira
  • †Setigerites
    • †Setigerites setiger
    • †Setigerites setigerus
  • †Shideleroceras
    • †Shideleroceras gracile
  • †Shivaella
    • †Shivaella nicklesi
  • †Sibyrhynchus – type locality for genus
    • †Sibyrhynchus denisoni – type locality for species
  • †Siderella
    • †Siderella scotti
  • †Sidetes
  • †Sievertsia
  • Fossilized stump of the Carboniferous-Permian club moss relative Sigillaria
    †Sigillaria
    • †Sigillaria brardii
    • †Sigillaria davreuxi
    • †Sigillaria kidstoni – tentative report
    • †Sigillaria mamillaris – or unidentified comparable form
    • †Sigillaria monostigma
    • †Sigillaria scutellata
  • †Sigillariostrobus
    • †Sigillariostrobus quadrangularis
  • †Silenites
    • †Silenites warei – or unidentified comparable form
  • †Sinochonetes
    • †Sinochonetes lepidus
  • †Sinuites
    • †Sinuites cancellatus
    • †Sinuites subcompressa
  • †Sinuitina
  • †Siphonophrentis
    • †Siphonophrentis elongata
    • †Siphonophrentis planima
    • †Siphonophrentis yandelli
  • †Skelidorygma
    • †Skelidorygma subcardiiformis
  • †Skenidioides
  • Sorosphaera – tentative report
  • †Sowerbyella
    • †Sowerbyella rugosa
  • †Spackmanites
    • †Spackmanites facierugosus – or unidentified comparable form
    • †Spackmanites habibii
  • †Spathella
    • †Spathella illinoiensis
  • †Spathiocaris
  • †Spathognathodus
    • †Spathognathodus snadjri – or unidentified comparable form
  • †Spatiopora
  • †Sphaerexochus
    • †Sphaerexochus romingeri
  • †Sphaerirhynchia
    • †Sphaerirhynchia stricklandi
  • †Sphaerocodium
  • †Sphaerocyclus – report made of unidentified related form or using admittedly obsolete nomenclature
    • †Sphaerocyclus tuber
  • †Sphenophyllostachys
  • Fossilized leaves and branches of the Devonian-Triassic horsetail relative Sphenophyllum
    †Sphenophyllum
    • †Sphenophyllum cuneifolium
    • †Sphenophyllum emarginatum
    • †Sphenophyllum hauchecornei
    • †Sphenophyllum myriophyllum
    • †Sphenophyllum plurifoliatum
  • †Sphenopteris
    • †Sphenopteris broadheadi
    • †Sphenopteris shatzlarensis
  • †Sphenosphaera
    • †Sphenosphaera mohri
    • †Sphenosphaera subangularis – type locality for species
  • †Spinocyrtia
    • †Spinocyrtia euryteines
  • †Spinozonotriletes
  • †Spinulicosta
    • †Spinulicosta spinulicosta
  • †Spinyplatyceras
    • †Spinyplatyceras milleri
  • Fossilized shell of the Late Ordovician-Late Triassic brachiopod Spirifer
    †Spirifer
    • †Spirifer angusta
    • †Spirifer bifurcatus
    • †Spirifer byrnesi
    • †Spirifer crawfordsvillensis
    • †Spirifer floydensis – tentative report
    • †Spirifer fornaculus
    • †Spirifer increbescens
    • †Spirifer keokuk
    • †Spirifer macrus
    • †Spirifer montgomeryensis
    • †Spirifer mundulus – or unidentified comparable form
    • †Spirifer pellaensis – tentative report
    • †Spirifer rostellatus
    • †Spirifer shepardi – or unidentified related form
    • †Spirifer shephardi – or unidentified related form
    • †Spirifer tenuicostatus
    • †Spirifer tenuimarginatus
    • †Spirifer varicosus
    • †Spirifer veronensis – or unidentified comparable form
    • †Spirifer washingtonensis
  • Spiropteris
  • Modern shells of the polychaete worm Spirorbis
    Spirorbis
  • †Spiroscala
  • †Sporangites
    • †Sporangites huronensis
  • †Springericrinus
    • †Springericrinus doris – tentative report
    • †Springericrinus magniventrus – tentative report
  • †Spyroceras
    • †Spyroceras nuntium
  • †Stacheia
    • †Stacheia cicatrix
    • †Stacheia trepeilopsiformis
  • †Staurocephalus
  • †Stegerhynchus
    • †Stegerhynchus indianense
    • †Stegerhynchus indianensis
    • †Stegerhynchus neglectum – or unidentified comparable form
    • †Stegerhynchus neglectus
    • †Stegerhynchus whitii
  • †Stelastellara
    • †Stelastellara parvula
  • †Stelliporella
    • †Stelliporella lamellata – or unidentified comparable form
  • †Stenoloron
    • †Stenoloron swallovana – type locality for species
  • †Stenopareia
  • †Stenoscisma
    • †Stenoscisma explanatum
  • †Stephanocrinus
    • †Stephanocrinus cornetti
    • †Stephanocrinus elongatus
    • †Stephanocrinus gemmiformis
    • †Stephanocrinus obpyramidalis
    • †Stephanocrinus quinquepartitus
  • †Stereolasma
    • †Stereolasma exile – tentative report
    • †Stereolasma parvulum
  • †Stethacanthulus – type locality for genus
    • †Stethacanthulus longipeniculus – type locality for species
    • †Stethacanthulus meccaensis
  • Life restorations of a male (foreground) and female (background) of the Late Devonian-Carboniferous Chimaera relative Stethacanthus
    †Stethacanthus
    • †Stethacanthus altonensis
    • †Stethacanthus longipeniculus – type locality for species
  • †Stictoporina
    • †Stictoporina granulifera
  • †Stigmaria
    • †Stigmaria ficoides
    • †Stigmaria wedingtonensis
  • †Stigmatella
    • †Stigmatella dubia
  • †Stinocrinus
  • †Stiptocrinus
    • †Stiptocrinus benedicti
    • †Stiptocrinus howardi
    • †Stiptocrinus ornatus
  • Stomatopora
  • †Straparollus
    • †Straparollus planodiscus
    • †Straparollus quadrivolvis – type locality for species
    • †Straparollus spergenensis – type locality for species
  • †Streblotrypa
  • †Streblotrypella
  • †Streptelasma
    • †Streptelasma divaricans
    • †Streptelasma vagans
  • †Striatopora
    • †Striatopora alba – tentative report
    • †Striatopora bellistriata
    • †Striatopora cavernosa
    • †Striatopora flexuosa
  • †Stricklandia – tentative report
  • †Striispirifer
  • †Stromatopora
    • †Stromatopora antiqua
  • †Stropeodonta
  • †Stropheodonta
    • †Stropheodonta demissa
  • †Strophochonetes
    • †Strophochonetes novascotica
  • †Strophodonta
    • †Strophodonta demissa
  • Fossilized shell of the Ordovician-Silurian brachiopod Strophomena
    †Strophomena
    • †Strophomena concordensis
    • †Strophomena erratica
    • †Strophomena extenuata
    • †Strophomena fissicosta
    • †Strophomena inequistriata
    • †Strophomena neglecta
    • †Strophomena nutans
    • †Strophomena planoconvexa
    • †Strophomena planumbona
    • †Strophomena scottensis
    • †Strophomena sulcata
    • †Strophomena vestusta
  • †Strophonella
    • †Strophonella semifasciata
    • †Strophonella williamsi
  • †Strophostylus
    • †Strophostylus cyclostomus
  • †Styliolina
  • †Stylolina
  • †Subglobosochonetes
  • †Sulcatina
    • †Sulcatina sulcata
  • †Sulcoretepora
  • †Sumixam – type locality for genus
    • †Sumixam maximus – type locality for species
  • †Sutcliffia
    • †Sutcliffia insignis
  • †Synbathocrinus
    • †Synbathocrinus swallovi
    • †Synbathocrinus swallowvi
  • †Synchysidendron
    • †Synchysidendron resinosum
  • Fossil of the Devonian tabulate coral Syringopora
    †Syringopora
    • †Syringopora hisingeri
    • †Syringopora monroensis
    • †Syringopora perelegans
  • †Syringoporida
  • †Syringothyris
    • †Syringothyris subcuspidatus – or unidentified comparable form
    • †Syringothyris textus

T
  • †Tabulipora
    • †Tabulipora cestriensis
    • †Tabulipora ramosa
  • †Taeniodictya
  • †Tamiobatis
    • †Tamiobatis springeri
  • †Tasmanites
  • Fossil of the Silurian-Carboniferous crinoid ("sea lily") Taxocrinus (right)
    †Taxocrinus
    • †Taxocrinus colletti
    • †Taxocrinus ungula – tentative report
  • †Tentaculites
    • †Tentaculites gracilistriatus
    • †Tentaculites sterlingensis
  • †Tetradium
    • †Tetradium huronense
  • †Tetranota
    • †Tetranota wisconsinensis
  • †Tetrasacculus
    • †Tetrasacculus stewarte – tentative report
  • †Thalamocrinus
  • Fossils of the burrow ichnogenus Thalassinoides
    †Thalassinoides
  • †Thalassoinoides
  • †Thamniscus
  • †Thamnopora
    • †Thamnopora limitaris
  • †Thamnoptychia
    • †Thamnoptychia alpenensis
    • †Thamnoptychia tuberculata – type locality for species
  • †Thecia
    • †Thecia minor – or unidentified comparable form
  • †Thuraminoides
    • †Thuraminoides sphaeroidalis
  • Thurammina
    • †Thurammina arenicorna
    • †Thurammina limbata
  • †Thuramminoides
    • †Thuramminoides sphaeroidalis
  • †Thuroholia
    • †Thuroholia spicatus – type locality for species
  • †Thymospora
    • †Thymospora pseudothiessenii
  • †Tolypaminna
    • †Tolypaminna frizzelli
    • †Tolypaminna rotula
  • †Tolypammina
    • †Tolypammina bransoni
    • †Tolypammina bulbosa
    • †Tolypammina cyclops
    • †Tolypammina gersterensis
    • †Tolypammina jacobschapelensis
    • †Tolypammina laocoon – or unidentified related form
    • †Tolypammina rotula
  • †Torispora
    • †Torispora securis
  • †Torynifer
    • †Torynifer pseudolineata
    • †Torynifer pseudolineatus
    • †Torynifer salemensis
    • †Torynifer setiger
  • †Tremanotus
    • †Tremanotus chicagoensis
  • †Trematis
    • †Trematis millepuntata
    • †Trematis millipunctata
  • †Trematocystis
    • †Trematocystis magniporatus
  • †Trematopora
  • †Trepeilopsis
    • †Trepeilopsis glomospiroides
    • †Trepeilopsis recurvidens
    • †Trepeilopsis spiralis
  • Fossilized shell of the Ordovician nautiloid cephalopod Treptoceras
    †Treptoceras
    • †Treptoceras cincinnatiensis
    • †Treptoceras duseri
    • †Treptoceras fosteri
    • †Treptoceras hitzi
  • †Triamara
    • †Triamara laevis
    • †Triamara tumida
    • †Triamara ventricosa – type locality for species
  • †Triangulotarbus – type locality for genus
    • †Triangulotarbus terrehautensis – type locality for species
  • †Tricopelta
    • †Tricopelta breviceps
  • Fossil of the Cambrian trilobite Tricrepicephalus
    †Tricrepicephalus
  • †Trigonocarpus
  • †Trigonoglossa
  • †Trimerella
  • †Trimerus
    • †Trimerus delphinocephalus
  • †Trimoceras
    • †Trimoceras gilberti
  • †Triplesia
    • †Triplesia putillus
  • †Triquitrites
    • †Triquitrites additus
    • †Triquitrites bransonii
    • †Triquitrites exiguus
    • †Triquitrites minutus
    • †Triquitrites protensus
    • †Triquitrites spinosus
    • †Triquitrites subspinosus
  • †Trochonema
    • †Trochonema madisonense
    • †Trochonema umbilicata – or unidentified comparable form
  • †Trochophyllum
  • †Troosticrinus
    • †Troosticrinus sanctipaulensis
  • †Trophocrinus
    • †Trophocrinus tumidus
  • †Tropidocaris
  • †Tropidoleptus
    • †Tropidoleptus carinatus
  • †Tryplasma
    • †Tryplasma parva
  • †Tubelelloides
    • †Tubelelloides longus
  • †Tuberculatosporites
    • †Tuberculatosporites robustus
  • †Tubulelloides
  • †Turneropterum – type locality for genus
    • †Turneropterum turneri – type locality for species
  • †Turrilepas
  • †Twenhofelella
    • †Twenhofelella waldroni – type locality for species
  • †Tylothyris

U
  • †Undulabucania
    • †Undulabucania gorbyi – type locality for species
  • †Unispirifer
    • †Unispirifer lateralis
    • †Unispirifer rundlensis – or unidentified related form
  • †Uperocrinus
    • †Uperocrinus apheles

V
  • †Valvisporites
  • †Vandelooaster
    • †Vandelooaster plicatilis
  • †Vaurealispongia
    • †Vaurealispongia minuta – type locality for species
  • †Vermiforichnus
  • †Vermiformichnus
  • †Verrucosisporites
    • †Verrucosisporites microtuberosus
    • †Verrucosisporites verrucosus
  • †Vesicaspora
    • †Vesicaspora wilsonii
  • †Vesicasporites
    • †Vesicasporites wilsonii
  • †Vestispora
    • †Vestispora costata
    • †Vestispora fenestrata
    • †Vestispora foveata
    • †Vestispora laevigata
    • †Vestispora pseudoreticulata
  • †Voiseyella
    • †Voiseyella novamexicana
  • †Voiseyells
    • †Voiseyells novamexicana – or unidentified related form
  • †Vorticina
    • †Vorticina cyrtolites

W
  • †Waltzispora
    • †Waltzispora prisca
  • †Warsawia
    • †Warsawia lateralis
  • †Waylandella
    • †Waylandella dartyensis
  • †Welleroceras
    • †Welleroceras liratum
  • †Whitfieldella
    • †Whitfieldella intermedia
    • †Whitfieldella nitida
  • †Whitfieldoceras – tentative report
    • †Whitfieldoceras casteri
  • †Whittleseya
  • †Wilsonicrinus
    • †Wilsonicrinus discoideus
  • †Wilsoniella
    • †Wilsoniella saffordi
  • †Wilsonites
    • †Wilsonites circularis
    • †Wilsonites vesicatus
  • †Worthenopora
    • †Worthenopora spinosa

X
  • †Xenocrinus

Y
  • †Youngiella – tentative report

Z
  • †Zaphrenthis
    • †Zaphrenthis aequus
    • †Zaphrenthis phrygia
  • †Zeacrinites
    • †Zeacrinites doverensis
    • †Zeacrinites trapezinatus
    • †Zeacrinites wortheni
  • †Zittelloceras
    • †Zittelloceras hitzi
    • †Zittelloceras lentidilatatum
    • †Zittelloceras shidleri
  • †Zonidiscus
    • †Zonidiscus youngi
  • Fossil of the feeding trace ichnogenus Zoophycos
    †Zoophycos
  • †Zophocrinus
    • †Zophocrinus howardi
  • †Zygospira
    • †Zygospira modesta
gollark: Oh, and they didn't support GBM for ages due to Nvidia consisting entirely of finite simple groups of size 808,017,424,794,512,875,886,459,904,961,710,757,005,754,368,000,000,000.
gollark: Although I actually haven't had any problems with Nvidia drivers in general, just CUDA randomly not working.
gollark: Audio is easy and just don't nvidia.
gollark: I would really expect it to be using hardware decoding, but I guess for AV1 it can't.
gollark: Maybe your scheduler is wrong.

References
  1. Stanislav Opluštil; Josef Pšenička; Jiří Bek (2019). "Omphalophloios wagneri sp. nov., a new sub-arborescent lycopsid from the middle Moscovian (Middle Pennsylvanian) of the Illinois Basin, USA". Review of Palaeobotany and Palynology. 271: Article 104105. doi:10.1016/j.revpalbo.2019.104105.
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