Eutaw Formation

The Eutaw Formation is a geological formation in North America, within the U.S. states of Alabama, Georgia, and Mississippi. The strata date from the late Coniacian to the early Santonian stage of the Late Cretaceous.[1] It consists of the upper Tombigbee Sand Member and an unnamed lower member. Dinosaur, mosasaur, and pterosaur remains have been recovered from the Eutaw Formation.[2][3]

Eutaw Formation Stratigraphic range: Upper Cretaceous
Type	Geological formation
Sub-units	Tombigbee Sand Member, Ingersoll Shale
Underlies	Austin Group and Mooreville Chalk Formation
Overlies	Tuscaloosa Group
Thickness	40 m (130 ft) to 120 m (390 ft)
Lithology
Primary	Glauconitic sandstone
Location
Region	Alabama, Georgia, Mississippi
Country	United States
Type section
Named for	Eutaw, Alabama

Stratigraphic column for the Eutaw

Vertebrate paleofauna

Mosasaurs

Mosasaurs of the Eutaw Formation
Taxa	Species	State	Stratigraphic position	Abundance	Notes	Images
Clidastes	Clidastes sp.[2]	Alabama.[2]			A mosasaurine	Eonatator sternbergii Platecarpus tympaniticus
Eonatator	E. sternbergii[2][4]	Alabama.[2]			A halisaurine E. sternbergii was formerly classified as Halisaurus sternbergii
Platecarpus	P. tympaniticus[2]	Alabama.[2]			A plioplatecarpine
Selmasaurus	S. russelli[2]	Alabama.[2]			A plioplatecarpine
Tylosaurus	Tylosaurus sp.[2]	Alabama.[2]			A tylosaurine

Ornithodires

Dinosaur feathers have been found in the Ingersoll Shale of Georgia, which is a subunit of the Eutaw Formation.[3] Indeterminate hadrosaurid remains have been found in Mississippi.[5]

Ornithodires of the Eutaw Formation
Genus	Species	State	Stratigraphic position	Abundance	Notes	Images
Pteranodon	Indeterminate	Georgia.[3]			A pteranodontid	Pteranodon sp.

See also

• List of fossil sites

References

1. Liu, Kaiyu. "Facies Changes of the Eutaw Formation (Coniacian-Santonian), Onshore to Offshore, Northeastern Gulf of Mexico Area". Department of Geological Sciences. University of Alabama. Retrieved 2009-02-10.
2. Kiernan, Caitlin R. (2002). "Stratigraphic distribution and habitat segregation of mosasaurs in the Upper Cretaceous of western and central Alabama, with an historical review of Alabama mosasaur discoveries". Journal of Vertebrate Paleontology. 22 (1): 91–103. doi:10.1671/0272-4634(2002)022[0091:SDAHSO]2.0.CO;2.
3. "Coastal Plain Geologic Province". The New Georgia Encyclopedia. Georgia Humanities Council and the University of Georgia Press. 2007-08-30. Retrieved 2009-02-10.
4. Bardet N, Suberbiola P, Iarochene M, Bouyahyaoui F, Bouya B, Amaghzaz M (2002). "A new species of Halisaurus from the Late Cretaceous phosphates of Morocco, and the phylogenetical relationships of the Halisaurinae (Squamata: Mosasauridae)". Zoological Journal of the Linnean Society. 143 (3): 447–472. doi:10.1111/j.1096-3642.2005.00152.x.
5. Kaye, John M.; Russell, Dale A. (January 1973). "The Oldest Record of Hadrosaurian Dinosaurs in North America". Journal of Paleontology. 47 (1): 91–93. JSTOR 1302869.