List of the Paleozoic life of Arkansas

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

A
  • †Adnatoceras
    • †Adnatoceras alaskense
  • †Ahrensisporites
    • †Ahrensisporites guerickei
  • †Amphiscapha
    • †Amphiscapha intermedius
  • †Amphissites
    • †Amphissites rugosus
  • †Amplexizaphrentis
    • †Amplexizaphrentis maneri – type locality for species
  • †Amplexizaphretis
    • †Amplexizaphretis maneri – type locality for species
  • †Amplexus
  • †Ananaspis
  • †Anchicrinus
    • †Anchicrinus planulatus
  • †Ancillotoechia
    • †Ancillotoechia marginata
  • †Angyomphalus
    • †Angyomphalus desultoria – type locality for species
    • †Angyomphalus discus
  • †Anomphalomorpha – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Anthracoceras
    • †Anthracoceras paucilobum
  • †Anthracomartus
    • †Anthracomartus trilobitus – type locality for species
  • †Anthracospirifer
  • †Antiquatonia
  • †Antirhynchonella
    • †Antirhynchonella thomasi
  • †Aphelaeceras
    • †Aphelaeceras arkansanum – type locality for species
  • †Aphralysia – tentative report
  • †Apiculatasporites
    • †Apiculatasporites variocorneus
  • †Apotocardium
    • †Apotocardium peculiare – type locality for species
    • †Apotocardium polymitarium – type locality for species
    • †Apotocardium snideri – tentative report
  • †Arcanoceras
    • †Arcanoceras furnishi – type locality for species
  • †Archaeocidaris
  • Archaeolithophyllum – tentative report
  • †Archimastax
    • †Archimastax americanus – type locality for species
  • Fossils of the Carboniferous-Permian bryozoan Archimedes
    †Archimedes
  • †Archimylacris
    • †Archimylacris venusta – type locality for species
  • †Arkacrinus
    • †Arkacrinus dubius
  • †Arkanites
    • †Arkanites relictus
  • †Arkoceras
    • †Arkoceras exiguum
  • †Asketomorpha – type locality for genus
    • †Asketomorpha grandis – type locality for species
  • †Asphaltina
  • †Astartella
    • †Astartella concentrica – or unidentified comparable form
  • †Athyris
  • †Atrypa
  • †Atrypina
    • †Atrypina erugata
  • Mold fossil of a shell of the Early Devonian-Late Triassic bivalve Aviculopecten
    †Aviculopecten
    • †Aviculopecten inspeciosus
    • †Aviculopecten jennyi
    • †Aviculopecten morrowensis
    • †Aviculopecten squamula
  • † Avonia
    • †Avonia honeycreekensis
  • †Axinolobus
    • †Axinolobus modulus – type locality for species

B
  • †Bactrites
    • †Bactrites carbonarius
    • †Bactrites gaitherensis
    • †Bactrites redactus
    • †Bactrites smithianus
  • †Bactritimimus
    • †Bactritimimus girtyi – type locality for species
    • †Bactritimimus ulrichi – type locality for species
  • †Baiosoma
    • †Baiosoma cucullata – type locality for species
  • Bairdia
    • †Bairdia girtyi
  • †Barytichisma
    • †Barytichisma clubinei
    • †Barytichisma ozarkana
  • †Baschkirites
    • †Baschkirites librovitchi
  • †Beecheria
  • †Bellerophon
    • †Bellerophon welshi
  • †Bisatoceras
    • †Bisatoceras secundum
  • †Bistrialites
    • †Bistrialites bicostatus – type locality for species
  • †Boesites
    • †Boesites scotti
  • †Borestus
  • †Boucotides
    • †Boucotides barrandei
  • †Brachycycloceras
    • †Brachycycloceras washingtonense – type locality for species
  • †Brachymimulus
    • †Brachymimulus americanus
    • †Brachymimulus elongatus
  • †Brachythyris
  • †Bradyphyllum
    • †Bradyphyllum lesliense – type locality for species
  • †Branneroceras
    • †Branneroceras branneri
  • †Bridgeites
    • †Bridgeites planidorsalis – type locality for species
  • †Buttsia
    • †Buttsia drabensis
  • †Buxtonia

C
  • †Cancelloceras
    • †Cancelloceras hunstvillense – type locality for species
    • †Cancelloceras huntsvillense – type locality for species
  • †Caneyella
    • †Caneyella peculiaris
    • †Caneyella percostata
    • †Caneyella wapanuckensis – or unidentified comparable form
  • †Caninostrotion
    • †Caninostrotion variabilis
  • †Carcharopsis
    • †Carcharopsis wortheni
  • †Cardiomorpha – tentative report
    • †Cardiomorpha inflata
  • †Caryocrinites
  • †Cavellina
  • †Cavusgnathus
  • †Centrotarphyceras
    • †Centrotarphyceras yellvillense
  • †Ceratopea
    • †Ceratopea unguis
  • †Cheilocephalus
    • †Cheilocephalus brachyops
  • Fossil of the Cambrian-Middle Devonian trilobite Cheirurus
    †Cheirurus
    • †Cheirurus phollikodes – type locality for species
    • †Cheirurus prolixus – type locality for species
  • †Choctawites
    • †Choctawites choctawensis
  • †Chonetes
  • †Clathrospira
    • †Clathrospira virguncula
  • †Cleiothyridina
  • †Cliffia
    • †Cliffia lataegenae
  • †Cluthoceras
    • †Cluthoceras glicki – type locality for species
  • †Clytoceras
    • †Clytoceras capax
  • †Coelogasteroceras
    • †Coelogasteroceras gracile
  • †Comanchia
    • †Comanchia amplooculata
  • Fossilized shell of the Late Devonian-Permian brachiopod Composita
    †Composita
  • †Compsonema
  • †Convolutispora
  • †Copiceras
    • †Copiceras erectum
  • †Cornuproetus
    • †Cornuproetus kyphora – type locality for species
  • †Cranaena
  • †Crassispora
    • †Crassispora kosankei
  • †Cravenoceras
    • †Cravenoceras lineolatum – type locality for species
  • †Criboconcha
  • †Cristatisporites
    • †Cristatisporites connexus
    • †Cristatisporites indignabundus
  • †Cromyocrinus
    • †Cromyocrinus grandis – type locality for species
  • †Crurithyris
    • †Crurithyris parva
  • †Ctenobactrites
    • †Ctenobactrites lesliensis – type locality for species
  • †Cupulocorona
    • †Cupulocorona gemmiformis
    • †Cupulocorona osgoodensis
  • †Cyclogranisporites
  • †Cycloplectoceras
    • †Cycloplectoceras funatum
    • †Cycloplectoceras miseri
  • †Cymoceras
    • †Cymoceras cracens
  • †Cymostrophia – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Cypricardella
    • †Cypricardella subalata
  • †Cypricardinia – tentative report
    • †Cypricardinia fayettevillensis
  • †Cyrtina

D
  • †Dalmanites – type locality for genus
    • †Dalmanites bassleri
    • †Dalmanites howelli
    • †Dalmanites ptyktorhion – type locality for species
  • †Decoroproetus
    • †Decoroproetus anaglyptus – type locality for species
    • †Decoroproetus corycoeus
  • Life restoration of two species of the Silurian trilobite Deiphon
    †Deiphon
    • †Deiphon longifrons
  • †Dellea
    • †Dellea suada
  • †Delops
  • †Densosporites
    • †Densosporites annulatus
    • †Densosporites irregularis
    • †Densosporites sphaerotriangularis
    • †Densosporites triangularis
  • †Dentoceras
    • †Dentoceras belemnitiforme – type locality for species
  • †Desmoinesia
  • †Diaboloceras
    • †Diaboloceras neumeieri – type locality for species
    • †Diaboloceras varicostatum
  • Fossil and mold of the Late Ordovician-Silurian trilobite Diacalymene
    †Diacalymene
    • †Diacalymene altirostris
  • †Diacamaropsis
    • †Diacamaropsis parva
  • †Diaphragmus
  • †Dicamaropsis
    • †Dicamaropsis parva
  • †Dicoelosia
    • †Dicoelosia bilobella
  • †Dielasma
  • †Dinocycloceras
    • †Dinocycloceras ballianum – or unidentified comparable form
    • †Dinocycloceras prolixum
  • †Diphuicrinus
    • †Diphuicrinus croneisi
  • †Dolerorthis – tentative report
    • †Dolerorthis nanella
  • †Dolorthoceras
    • †Dolorthoceras caneyanum – or unidentified comparable form
    • †Dolorthoceras incisum – type locality for species
    • †Dolorthoceras tenuifilosum – type locality for species

E
  • †Echinaria
  • †Echinoconchus
  • †Economolopsis – type locality for genus
    • †Economolopsis gordoni – type locality for species
  • †Ectogrammysia – type locality for genus
    • †Ectogrammysia crassatis – type locality for species
  • †Edmondia
    • †Edmondia equilateralis
  • †Edmooroceras
    • †Edmooroceras plummeri
  • Fossil of the Middle Ordovician-Early Devonian trilobite Encrinurus
    †Encrinurus
    • †Encrinurus egani
  • †Endolobus
    • †Endolobus clorensis
  • †Eoasianites
    • †Eoasianites smithwickensis
  • †Eophacops
    • †Eophacops fontana – type locality for species
  • †Eopteria
    • †Eopteria richardsoni
  • †Eospirifer
    • †Eospirifer acutolineatus
  • †Eowellerites
    • †Eowellerites discoidalis – type locality for species
    • †Eowellerites moorei – or unidentified comparable form
  • †Ephippioceras
    • †Ephippioceras ferratum
  • †Epistroboceras
    • †Epistroboceras lesliense – type locality for species
    • †Epistroboceras mangeri – type locality for species
    • †Epistroboceras pitkinense – type locality for species
  • Fossilized calyx of the Silurian-Middle Devonian crinoid ("sea lily") Eucalyptocrinites
    †Eucalyptocrinites
  • †Euchondria
  • †Euconospira
    • †Euconospira desereti – or unidentified related form
    • †Euconospira disjuncta
  • †Euloxoceras
    • †Euloxoceras angustius – type locality for species
    • †Euloxoceras greenei
  • †Eumetria
  • †Eumorphoceras
    • †Eumorphoceras bisulcatum
    • †Eumorphoceras milleri – type locality for species
    • †Eumorphoceras ornatissimum – or unidentified comparable form
  • Fossilized shell of the Silurian-Permian sea snail Euomphalus
    †Euomphalus
    • †Euomphalus konobasis – type locality for species
    • †Euomphalus variabilis – type locality for species
  • †Eupachycrinus
    • †Eupachycrinus magister – or unidentified comparable form
  • †Euphemites
    • †Euphemites chesterensis – type locality for species
    • †Euphemites whirligigi – type locality for species

F
  • †Fayettevillea
    • †Fayettevillea planorbis – type locality for species
  • †Florinites
    • †Florinites similis
    • †Florinites volans

G
  • †Garwoodia – tentative report
  • †Gastrioceras
    • †Gastrioceras adaense
    • †Gastrioceras fittsi
    • †Gastrioceras formosum – type locality for species
  • Fossil of the bore-hole ichnogenus Gastrochaenolites (G)
    Gastrochaenolites
    • †Gastrochaenolites anauchen
  • †Gattendorfia
  • †Geisina – tentative report
    • †Geisina retiferiformis
  • †Girtyoceras
    • †Girtyoceras welleri – type locality for species
  • †Girtyspira
    • †Girtyspira microspirula – type locality for species
  • †Girvanella
  • †Glabrocingulum
    • †Glabrocingulum binodosum
    • †Glabrocingulum coronulum – type locality for species
    • †Glabrocingulum parasolum – type locality for species
    • †Glabrocingulum parvanodum – type locality for species
    • †Glabrocingulum quadrigatum
  • †Glaphyrites
    • †Glaphyrites depressus
    • †Glaphyrites fayettevillae – type locality for species
    • †Glaphyrites morrowensis
  • †Globozyga
    • †Globozyga mediocris – type locality for species
  • †Glyphiolobus
  • Fossil of the Silurian trilobite Glyptambon
    †Glyptambon – type locality for genus
    • †Glyptambon verrucosus
  • †Glyptopleura
    • †Glyptopleura angulata
    • †Glyptopleura inopinata
  • †Gnathodus
    • †Gnathodus texanus
  • †Goniatites
    • †Goniatites crenistria – or unidentified related form
    • †Goniatites granosus
    • †Goniatites multiliratus
  • †Gordonites
    • †Gordonites filifer
    • †Gordonites matheri
  • †Granulatisporites
    • †Granulatisporites adnatoides
  • †Graphiadactyllis
    • †Graphiadactyllis arkansana
    • †Graphiadactyllis fayettevillensis

H
  • †Haplistion
    • †Haplistion sphaericum
  • †Harpidella
    • †Harpidella butorus – type locality for species
    • †Harpidella spinulocervix
  • †Healdia
  • †Hematites
    • †Hematites barbarae
  • †Holocystites
    • †Holocystites alternatus
  • †Homoceratoides
    • †Homoceratoides cracens
  • †Homoeospirella
    • †Homoeospirella costatula
    • †Homoeospirella pygmaea
  • †Hormotoma
    • †Hormotoma anna
    • †Hormotoma artemesia – type locality for species
  • †Housia
    • †Housia vacuna
  • †Howellella
    • †Howellella splendens
  • †Hudsonoceras
    • †Hudsonoceras moorei
  • †Hustedia
  • †Hydreionocrinus
  • †Hypotetragona – tentative report

I
  • †Imitoceras
    • †Imitoceras sinuatum – type locality for species
  • †Imoella – type locality for genus
    • †Imoella obscura – type locality for species
  • †Imogloba
    • †Imogloba gandyensis
  • †Imonautilus – type locality for genus
    • †Imonautilus meeki – type locality for species
  • †Incisurella
    • †Incisurella prima
  • †Inflatia
    • †Inflatia clydensis
  • †Irvingella
    • †Irvingella major

J
  • †Janthimorpha – report made of unidentified related form or using admittedly obsolete nomenclature
  • †Jasperoceras
    • †Jasperoceras costatum

K
  • †Kaskia
    • †Kaskia chesterensis
  • †Kazakhstania – tentative report
  • †Kindbladia
    • †Kindbladia wichitaensis
  • †Kinkaidia
    • †Kinkaidia trigonalis
  • †Kirkbya
    • †Kirkbya reflexa
  • †Kirkbyella
    • †Kirkbyella quadrata
  • †Knightoceras
    • †Knightoceras oxylobatum – type locality for species
    • †Knightoceras patulum
  • †Knoxisporites
    • †Knoxisporites triradiatus
  • †Kozlowskiellina
    • †Kozlowskiellina vaningeni
  • †Krotovia

L
  • †Laevigatosporites
    • †Laevigatosporites desmoinesensis
    • †Laevigatosporites vulgaris
  • †Lasanocrinus
    • †Lasanocrinus strigosus
  • †Leangella
    • †Leangella dissiticostella
  • †Leonardophyllum
    • †Leonardophyllum arkansanum
  • †Lepdioproetus
    • †Lepdioproetus xeo – type locality for species
  • †Leptaena
  • †Leptagonia
  • †Leptocyrtoceras
    • †Leptocyrtoceras curvatum
    • †Leptocyrtoceras powellense
  • †Leptodesma
  • †Limipecten
  • †Lingula
  • †Linoproductus
  • †Liroceras – tentative report
  • †Lissatrypa
    • †Lissatrypa clairensis
  • †Lissostrophia
  • †Lophamplexus – tentative report
  • †Lophophyllidium
    • †Lophophyllidium imoense – type locality for species
  • †Lophotriletes
    • †Lophotriletes microsaetosus
  • †Lusitanites
    • †Lusitanites subcircularis
  • †Lycospora
    • †Lycospora micropapillata
    • †Lycospora pellucida
  • †Lygdozoon – type locality for genus
    • †Lygdozoon anoplos – type locality for species
    • †Lygdozoon arkansanum
    • †Lygdozoon collatum – type locality for species
  • †Lysocystites – or unidentified related form

M
  • †Macropotamorhynchus
    • †Macropotamorhynchus chouteauensis
    • †Macropotamorhynchus tuta
  • †Macrostylocrinus
  • †Magnumbonella
  • †Mammoides
  • †Mariceras
  • †Marmolatella
    • †Marmolatella imoensis – type locality for species
    • †Marmolatella macgordoni – type locality for species
  • †Meekospira
    • †Meekospira minuta
  • †Megaglossoceras
    • †Megaglossoceras glicki – type locality for species
  • †Megapronorites
    • †Megapronorites baconi
  • †Meristina
    • †Meristina clairensis
  • Fossilized shell of the Carboniferous-Permian nautiloid cephalopod Metacoceras
    †Metacoceras
  • †Metacromyocrinus
    • †Metacromyocrinus gillumi
  • †Metadimorphoceras
    • †Metadimorphoceras subdivisum
  • †Metutharocrinus
    • †Metutharocrinus cockei – type locality for species
  • †Michelinia
    • †Michelinia macerimuris – type locality for species
    • †Michelinia meekana
    • †Michelinia tenuicula
  • †Michelinoceras
    • †Michelinoceras wapanuckense
  • †Microcheilinella – tentative report
  • †Mitorthoceras
    • †Mitorthoceras crebriliratum
    • †Mitorthoceras girtyi – type locality for species
    • †Mitorthoceras perfilosum
    • †Mitorthoceras yellvillense – type locality for species
  • †Monoceratina
  • †Mooreoceras
    • †Mooreoceras wedingtonianum – type locality for species
  • †Mourlonia
    • †Mourlonia lativittata
  • †Muensteroceras
    • †Muensteroceras arkansanum – type locality for species
    • †Muensteroceras collinsoni – type locality for species
    • †Muensteroceras pisiforme – type locality for species
  • †Multithecopora
  • †Myalina
    • †Myalina parallela – or unidentified comparable form

N
  • †Naiadites – tentative report
  • Fossilized shell of the Early Devonian – Triassic sea snail Naticopsis
    †Naticopsis
    • †Naticopsis clinovata – or unidentified comparable form
    • †Naticopsis genevievensis
  • †Neochonetes
  • †Neoglyphioceras
    • †Neoglyphioceras caneyanum
    • †Neoglyphioceras crebriliratum
  • †Nostocites
  • †Nucleospira
    • †Nucleospira raritas
  • †Nuculavus
    • †Nuculavus okawensis
  • †Nuculopsis
    • †Nuculopsis shumardana

O
  • †Ogygoceras
    • †Ogygoceras gracile
  • †Onychotreta
    • †Onychotreta lenta
    • †Onychotreta mesleri
    • †Onychotreta miseri
    • †Onychotreta multiplicata
    • †Onychotreta plicata
  • †Orbiculoidea
  • †Orospira
    • †Orospira elegantula
  • †Orthobairdia
    • †Orthobairdia cestriensis
  • †Orthonychia
    • †Orthonychia compressum
    • †Orthonychia ungula
  • †Orthostrophella
    • †Orthostrophella clairensis
  • †Orthotetes
  • †Ortonella – tentative report
    • †Ortonella kershopensis
  • †Ovatia
  • †Oxoplecia
    • †Oxoplecia infrequens
  • †Ozarcus – type locality for genus
    • †Ozarcus mapesae – type locality for species

P
  • †Pachylyroceras
    • †Pachylyroceras cloudi
    • †Pachylyroceras newsomi
  • †Paladin
    • †Paladin mucronatus
  • †Palaeacis
    • †Palaeacis carinata
  • †Palaeocapulus
    • †Palaeocapulus undata
  • †Palaeoneilo
    • †Palaeoneilo sera
  • †Paleoconus
    • †Paleoconus bakeri – type locality for species
  • †Paleyoldia
    • †Paleyoldia angustia – type locality for species
    • †Paleyoldia bruta – type locality for species
  • †Palmerocrinus
    • †Palmerocrinus kesslerensis – type locality for species
  • †Paracravenoceras
    • †Paracravenoceras ozarkense – type locality for species
  • †Paracromyocrinus
    • †Paracromyocrinus oklahomensis
  • †Paradimorphoceras
  • †Paralegoceras
    • †Paralegoceras iowense
    • †Paralegoceras texanum
  • †Parallelodon
    • †Parallelodon cancellosus – or unidentified comparable form
  • †Paramphicrinus
    • †Paramphicrinus magnus – type locality for species
  • †Paraparchites – tentative report
    • †Paraparchites cyclopeus
  • †Parastrophinella
    • †Parastrophinella lepida
  • †Parvaxon
    • †Parvaxon minutum
  • †Patellilabia
    • †Patellilabia laevigata
    • †Patellilabia rhombadella – type locality for species
    • †Patellilabia sulcata – type locality for species
  • Fossilized theca of the Carboniferous blastoid echinoderm ("sea bud") Pentremites
    †Pentremites
  • †Pericyclus
  • †Perigrammoceras
  • †Perimestocrinus
    • †Perimestocrinus teneris
  • †Peripetoceras
    • †Peripetoceras ozarkense – type locality for species
  • †Permophorus
  • †Phaneroceras
    • †Phaneroceras compressum
    • †Phaneroceras kesslerense – type locality for species
  • †Pharkidonotus
  • †Phestia
    • †Phestia corrugata – type locality for species
    • †Phestia obtusa – type locality for species
    • †Phestia wortheni – type locality for species
  • †Phricodothyris
  • †Pilosisporites
    • †Pilosisporites williamsii
  • †Pionoceras
    • †Pionoceras smithvillense
  • †Placotriplesia
    • †Placotriplesia juvenis
    • †Placotriplesia praecipta
  • Fossilized shell of the Silurian-Early Triassic sea snail Platyceras
    †Platyceras
    • †Platyceras latum
    • †Platyceras oxynotum – type locality for species
  • †Plectatrypa
    • †Plectatrypa arctoimbricata
  • †Plectodonta – tentative report
  • †Plicochonetes
  • †Plicocyrtia
    • †Plicocyrtia arkansana
  • †Polidevcia
    • †Polidevcia stevensiana
  • †Posidonia
    • †Posidonia nasuta
  • †Productina
    • †Productina sampsoni
  • †Productus
  • Restoration of the Silurian trilobite Proetus
    †Proetus
    • †Proetus vaningeni
  • †Prolecanites
    • †Prolecanites lyoni – or unidentified comparable form
  • †Proshumardites
    • †Proshumardites morrowanus
  • †Prospira
    • †Prospira latior
  • †Prothyris
    • †Prothyris crista – type locality for species
    • †Prothyris soleniformis – or unidentified comparable form
  • †Protocycloceras
    • †Protocycloceras arkansaense
    • †Protocycloceras smithvillense
  • †Pseudagnostus
    • †Pseudagnostus communis
  • †Pseudokingstonia
    • †Pseudokingstonia exotica
  • †Pseudopronorites
    • †Pseudopronorites arkansiensis
    • †Pseudopronorites quinni
  • †Pseudorthoceras
    • †Pseudorthoceras knoxense
    • †Pseudorthoceras stonense – type locality for species
  • †Pseudozygopleura
  • †Pterocephalia
    • †Pterocephalia sanctisabae
  • †Ptychomphalina
    • †Ptychomphalina magna – type locality for species
  • †Punctospirifer
  • †Pycnoceras
    • †Pycnoceras clausum
  • †Pygmaeoceras
    • †Pygmaeoceras solidum

Q
  • †Quinnites
    • †Quinnites henbesti
    • †Quinnites textum

R
  • †Radnoria
  • †Ramosites
  • †Raphiophorus
    • †Raphiophorus niagarensis
  • †Rayonnoceras
    • †Rayonnoceras eccentricum – type locality for species
    • †Rayonnoceras fayettevillense
    • †Rayonnoceras irregulare – or unidentified comparable form
    • †Rayonnoceras nobile – or unidentified comparable form
    • †Rayonnoceras protentum – type locality for species
    • †Rayonnoceras solidiforme
    • †Rayonnoceras vaughanianum
  • †Rectangulina
  • †Resserella
  • †Reticulariina
  • †Reticuloceras
    • †Reticuloceras tiro
    • †Reticuloceras wainwright
    • †Reticuloceras wainwrighti
  • †Reticycloceras
    • †Reticycloceras croneisi – type locality for species
    • †Reticycloceras girtyi – type locality for species
    • †Reticycloceras peytonense – type locality for species
    • †Reticycloceras sequoyahense
  • †Retispira
    • †Retispira cincta
    • †Retispira ordinata – or unidentified related form
    • †Retispira yochelsoni – type locality for species
  • †Retites
    • †Retites semiretia
  • †Reviya
    • †Reviya planus – or unidentified related form
  • †Rhipidomella
  • †Rhynchopora
  • †Rhytiophora
    • †Rhytiophora blairi
  • †Richardsonites
    • †Richardsonites richardsonianum
    • †Richardsonites richardsonianus
  • †Roundyella
    • †Roundyella simplex

S
  • †Sandia
  • †Sanguinolites
    • †Sanguinolites simulans – tentative report
  • †Sansabella
    • †Sansabella fayettevillensis
    • †Sansabella reticulata
  • †Savitrisporites
    • †Savitrisporites nux
  • †Schartymites
    • †Schartymites paynei
  • †Schellwienella
  • †Schizodus
    • †Schizodus chesterensis
  • †Schizophoria
  • †Schuchertella
  • †Schulzospora
    • †Schulzospora rara
  • †Schumardella
    • †Schumardella obsolecens
  • †Sedenticellula
  • †Sedgwickia
  • †Seminolites
  • †Septatrypa
    • †Septatrypa havliceki
  • †Septimyalina
    • †Septimyalina perattenuata – or unidentified comparable form
  • †Serenida
    • †Serenida seminalis
  • †Shaleria
  • †Solenochilus
    • †Solenochilus floweri – type locality for species
    • †Solenochilus peculiare – or unidentified comparable form
  • †Solenomorpha
    • †Solenomorpha nitida
  • †Spathelopsis – type locality for genus
    • †Spathelopsis browni – type locality for species
  • Fossil of the Middle Ordovician-Silurian trilobite Sphaerexochus
    †Sphaerexochus
    • †Sphaerexochus glaber – type locality for species
  • †Sphenotus
    • †Sphenotus branneri
    • †Sphenotus dubius
    • †Sphenotus meslerianus
    • †Sphenotus pisinnus – type locality for species
    • †Sphenotus washingtonensis
  • Fossilized shell of the Late Ordovician-Late Triassic brachiopod Spirifer
    †Spirifer
  • †Spiriferellina
  • †Staurocephalus
    • †Staurocephalus lagena – type locality for species
    • †Staurocephalus oarion – type locality for species
  • †Stearoceras
    • †Stearoceras gibbosum – or unidentified related form
    • †Stearoceras smithi – type locality for species
  • †Stenoglaphyrites
    • †Stenoglaphyrites involutus – type locality for species
    • †Stenoglaphyrites miseri – type locality for species
  • †Stenopronorites
  • †Sthenarocalymene
    • †Sthenarocalymene scutula – type locality for species
  • Fossil preserved in situ of a Carboniferous tree-like club moss relative with attached Stigmaria rhizome system
    †Stigmaria
    • †Stigmaria wedingtonensis
  • †Stioderma
    • †Stioderma hadra – type locality for species
  • †Streptis
    • †Streptis glomerata
  • †Streptorhynchus
  • †Strobeus
  • †Stroboceras
    • †Stroboceras gordoni – type locality for species
    • †Stroboceras sulcatum – or unidentified comparable form
  • †Sudeticeras
  • †Sulcella
  • †Sulcogirtyoceras
    • †Sulcogirtyoceras jasperense – type locality for species
    • †Sulcogirtyoceras limatum
  • †Sutherlandia
  • †Syngastrioceras
    • †Syngastrioceras globosum
    • †Syngastrioceras oblatum
    • †Syngastrioceras scotti
  • †Syntrophopsis
    • †Syntrophopsis grandis – type locality for species

T
  • †Tectamichelina – type locality for genus
    • †Tectamichelina mangeri – type locality for species
  • †Teiichispira
    • †Teiichispira odenvillensis
  • †Tesuquea
  • †Tetracamera
  • †Tetratylis – tentative report
  • †Tetratylus – tentative report
  • †Torynifer
  • †Trepspira
    • †Trepspira tentative report type locality for species – informal
  • †Triboloceras – tentative report
  • †Tripteroceroides – tentative report
  • Fossils of the bore-hole ichnogenus Trypanites
    Trypanites
  • †Tylonautilus
    • †Tylonautilus gratiosus

U
  • †Utharocrinus
    • †Utharocrinus pentanodus

V
  • †Valhallites
    • †Valhallites ornatus – type locality for species
    • †Valhallites tuberculatus – type locality for species
    • †Valhallites westforkensis – type locality for species
  • †Verneuilites
    • †Verneuilites pygmaeus
  • †Virgaspongia – type locality for genus
    • †Virgaspongia ichnata – type locality for species
  • †Virginiata
    • †Virginiata arkansana
  • †Voiseyella
  • †Vorticina
    • †Vorticina venata

W
  • †Wichitoceras
    • †Wichitoceras compressum
  • †Wiedeyoceras
    • †Wiedeyoceras williamsi – type locality for species
  • †Wilkingia
    • †Wilkingia inflata – or unidentified comparable form
  • †Winslowoceras
    • †Winslowoceras henbesti – type locality for species

X
  • †Xenocheilos
    • †Xenocheilos minutum

Y
  • †Yochelsonospira
    • †Yochelsonospira tenuilineata

Z
  • †Zaphrentites
    • †Zaphrentites arkansanus
  • †Zia
  • †Zygopleura – report made of unidentified related form or using admittedly obsolete nomenclature

References
  • Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 7 August 2017.
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