Eutaw Formation

Eutaw Formation
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

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]

Vertebrate paleofauna

Cartilaginous fish

Cartilaginous fish of the Eutaw Formation
Taxa	Species	State	Stratigraphic position	Abundance	Notes	Images
Archaeolamna	A. kopingensis^[4]	Alabama^[4]			A lamniform shark	File:MenuhaCretoxyrhinaMantelli.jpg Tooth of Cretoxyrhina mantelli File:Ischyrhiza mira.jpg Ischyrhiza mira rostral spines File:ScapanorhynchusCretaceousIsraelTwo.jpg Teeth of Scapanorhynchus texanus File:Squalicorax falcatusDB.jpg Squalicorax falcatus
Borodinopristis	B. schwimmeri^[4]	Alabama^[4]			A sclerorhynchid
Brachyrhizodus	B. mcnultyi^[4]	Alabama^[4]			Myliobatids
Brachyrhizodus	B. wichitaensis^[4]	Alabama^[4]			Myliobatids
Carcharias	C. sp.^[4]	Alabama^[4]			A lamniform shark
Cantioscyllium	C. globidens^[4]	Alabama^[4]			Carpet sharks
Cantioscyllium	C. decipiens (=C. meyeri or C. saginatus?)^[4]	Alabama^[4]			Carpet sharks
Chiloscyllium	C. greeni^[4]	Alabama^[4]			A hemiscylliid
Cretodus	C. semiplicatus^[4]	Alabama^[4]			A lamniform shark
Cretalamna	C. appendiculata^[4]	Alabama^[4]			Otodontids
Cretalamna	C. serrata^[4]	Alabama^[4]			Otodontids
Cretoxyrhina	C. mantelli^[4]	Alabama^[4]			A lamniform shark
Edaphodon	E. sp.^[4]	Alabama^[4]			A chimaera
Heterodontus?	H. sp.^[4]	Alabama^[4]			A heterodontiform
Hybodus	H. sp.^[4]	Alabama^[4]			A hybodontid
Ischyrhiza	I. mira^[4]	Alabama^[4]			A rajiform
Lissodus (=Lonchidion?)	L. sp.^[4]	Alabama^[4]			A hybodontid
Paranomotodon	P. angustidens^[4]	Alabama^[4]			A lamniform shark
Pseudocorax	P. laevis^[4]	Alabama^[4]			A lamniform shark
Pseudohypolophus (=Brachyrhizodus?)	P. mcnultyi^[4]	Alabama^[4]			A rajiform
Ptychodus	P. mortoni^[4]	Alabama^[4]			Ptychodontids
	P. polygyrus^[4]
	P. rugosus^[4]
Ptychotrygon	P. triangularis (=P. vermiculata and/or P. chattahoochiensis?)^[4]	Alabama^[4]			A ptychotrygonid
Rajiformes indet.^[4]		Alabama^[4]
Scapanorhynchus	S. raphiodon^[4]	Alabama^[4]			Lamniform sharks
Scapanorhynchus	S. texanus^[4]	Alabama^[4]			Lamniform sharks
Sclerorhynchus?	S. sp.^[4]	Alabama^[4]			A rajiform
Squalicorax	S. falcatus^[4]	Alabama^[4]			Lamniform sharks
	S. kaupi^[4]
	S. pristodontus^[4]
Squatina	S. hassei^[4]	Alabama^[4]			A squatinid

Bony fish

Bony fish of the Eutaw Formation
Taxa	Species	State	Stratigraphic position	Abundance	Notes	Images
Albula	A. dunklei^[4]	Alabama^[4]			A bonefish	File:Enchodus petrosus.jpg Enchodus petrosus File:Protosphyraena2Kansas.jpg Protosphyraena File:Stratodus DB12.jpg Stratodus File:Xiphactinus audax.png Xiphactinus audax
Anomoeodus	A. phaseolus^[4]	Alabama^[4]			A pycnodontid
Atractosteus	A. sp.?^[4]	Alabama^[4]			A gar
Bananogmius	B. sp.^[4]	Alabama^[4]			A plethodid
Belonostomus	B. sp.^[4]	Alabama^[4]			An aspidorhynchiform
Enchodus	E. petrosus^[4]	Alabama^[4]			An enchodontid
Hadrodus	H. priscus^[4]	Alabama^[4]			A pycnodontid
Lepisosteus	L. sp.^[4]	Alabama^[4]			A gar
Mawsonia	M. sp.^[4]	Alabama^[4]			A coelacanthiform fish
Phacodus	P. puncatatus^[4]	Alabama^[4]			A pycnodontiform
Protosphyraena	P. sp.^[4]	Alabama^[4]			A pachycormiform
Stratodus	S. apicalis^[4]	Alabama^[4]			An aulopiform
Xiphactinus	X. audax^[4]	Alabama^[4]			An ichthyodectid

Turtles

Turtles of the Eutaw Formation
Taxa	Species	State	Stratigraphic position	Abundance	Notes	Images
Chedighaii	C. barberi^[4]	Alabama^[4]			A bothremydid	File:Protostega gigas.jpg Protostega gigas
Protostega	P. gigas^[4]	Alabama^[4]			A protostegid
Thinochelys	T. sp.^[4]	Alabama^[4]
Toxochelys	T. sp.^[4]	Alabama^[4]
Trionychidae indet.^[4]		Alabama^[4]

Plesiosaurs

Plesiosaurs of the Eutaw Formation
Taxa	Species	State	Stratigraphic position	Abundance	Notes	Images
Discosaurus	D. vetustus^[4]	Alabama^[4]			An elasmosaurid	File:Discosaurus.jpg Vertebrae of D. vestutus
Elasmosauridae indet.^[4]		Alabama^[4]

Mosasaurs

Mosasaurs of the Eutaw Formation
Taxa	Species	State	Stratigraphic position	Abundance	Notes	Images
Clidastes	Clidastes sp.^[2]^[4]	Alabama^[2]^[4]			A mosasaurine	File:Eonatator BW.jpg Eonatator sternbergii File:Platecarpus tympaniticus.jpg Platecarpus tympaniticus File:Tylosaurus proriger skull brightened.jpg Tylosaurus proriger skull
Eonatator	E. sternbergii^[2]^[5]	Alabama^[2]			A halisaurine E. sternbergii was formerly classified as Halisaurus sternbergii
Globidens	G. alabamaensis^[4]	Alabama^[4]			A mosasaurine
Platecarpus	P. tympaniticus^[2]^[4]	Alabama^[2]^[4]			A plioplatecarpine
Plioplatecarpus	P. sp.^[4]	Alabama^[4]			A plioplatecarpine
Selmasaurus	S. russelli^[2]^[4]	Alabama^[2]^[4]			A plioplatecarpine
Tylosaurus	T. nepaeolicus^[4]	Alabama^[4]			Tylosaurines
Tylosaurus	T. proriger^[4]	Alabama^[4]			Tylosaurines

Crocodylians

Crocodylians of the Eutaw Formation
Genus	Species	State	Stratigraphic position	Abundance	Notes	Images
Borealosuchus	B. sp.^[4]	Alabama^[4]			An eusuchian	File:Alligatoridae - Deinosuchus.jpg A skull of Deinosuchus
Deinosuchus	D. rugosus?^[4]	Alabama^[4]			An alligatoroid
Leidyosuchus	L. sp.^[4]	Alabama^[4]			An alligatoroid

Ornithodires

Dinosaur feathers have been found in the Ingersoll Shale of Georgia,^[6]^[7] which is a subunit of the Eutaw Formation.^[3] Indeterminate hadrosaurid remains have been found in Mississippi.^[8] Ornithomimosaurs of medium-size and large-size have also been unearthed in Mississippi.^[9]

Ornithodires of the Eutaw Formation
Genus	Species	State	Stratigraphic position	Abundance	Notes	Images
Lophorhothon	L. atopus^[4]	Alabama^[4]			A hadrosauromorph dinosaur	File:Lophorhothon atopus.jpg Illustration of a fossil of Lophorhothon File:Pteranodon hharder.jpg Pteranodon sp.
Pteranodon	Indeterminate	Georgia^[3]			A pteranodontid pterosaur

References

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Eutaw Formation

Contents

Vertebrate paleofauna

Cartilaginous fish

Bony fish

Turtles

Plesiosaurs

Mosasaurs

Crocodylians

Ornithodires

See also

References

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Eutaw Formation

Vertebrate paleofauna

Cartilaginous fish

Bony fish

Turtles

Plesiosaurs

Mosasaurs

Crocodylians

Ornithodires

See also

References

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