Eutaw Formation
Geological formation in the southern United States
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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 |
Vertebrate paleofauna
Cartilaginous fish
| Cartilaginous fish of the Eutaw Formation | ||||||
|---|---|---|---|---|---|---|
| Taxa | Species | State | Stratigraphic position | Abundance | Notes | Images |
|
A. kopingensis[4] |
A lamniform shark |
    | ||||
|
Borodinopristis |
B. schwimmeri[4] |
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|
Brachyrhizodus |
B. mcnultyi[4] |
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|
B. wichitaensis[4] |
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|
C. sp.[4] |
A lamniform shark | |||||
|
C. globidens[4] |
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|
C. decipiens (=C. meyeri or C. saginatus?)[4] |
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|
C. greeni[4] |
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|
C. semiplicatus[4] |
A lamniform shark | |||||
|
C. appendiculata[4] |
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|
C. serrata[4] |
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|
C. mantelli[4] |
A lamniform shark | |||||
|
E. sp.[4] |
A chimaera | |||||
|
H. sp.[4] |
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|
H. sp.[4] |
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|
I. mira[4] |
A rajiform | |||||
|
Lissodus (=Lonchidion?) |
L. sp.[4] |
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|
Paranomotodon |
P. angustidens[4] |
A lamniform shark | ||||
|
P. laevis[4] |
A lamniform shark | |||||
|
Pseudohypolophus (=Brachyrhizodus?) |
P. mcnultyi[4] |
A rajiform | ||||
|
P. mortoni[4] |
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|
P. polygyrus[4] |
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|
P. rugosus[4] |
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|
P. triangularis (=P. vermiculata and/or P. chattahoochiensis?)[4] |
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|
Rajiformes indet.[4] |
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|
S. raphiodon[4] |
Lamniform sharks | |||||
|
S. texanus[4] |
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|
S. sp.[4] |
A rajiform | |||||
|
S. falcatus[4] |
Lamniform sharks | |||||
|
S. kaupi[4] |
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|
S. pristodontus[4] |
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|
S. hassei[4] |
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Bony fish
| Bony fish of the Eutaw Formation | ||||||
|---|---|---|---|---|---|---|
| Taxa | Species | State | Stratigraphic position | Abundance | Notes | Images |
|
A. dunklei[4] |
A bonefish |
    | ||||
|
A. phaseolus[4] |
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|
A. sp.?[4] |
A gar | |||||
|
B. sp.[4] |
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|
B. sp.[4] |
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|
E. petrosus[4] |
An enchodontid | |||||
|
Hadrodus |
H. priscus[4] |
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|
L. sp.[4] |
A gar | |||||
|
M. sp.[4] |
A coelacanthiform fish | |||||
|
Phacodus |
P. puncatatus[4] |
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|
P. sp.[4] |
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|
S. apicalis[4] |
An aulopiform | |||||
|
X. audax[4] |
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Turtles
Plesiosaurs
| Plesiosaurs of the Eutaw Formation | ||||||
|---|---|---|---|---|---|---|
| Taxa | Species | State | Stratigraphic position | Abundance | Notes | Images |
|
D. vetustus[4] |
An elasmosaurid |
 | ||||
|
Elasmosauridae indet.[4] |
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Mosasaurs
Crocodylians
| Crocodylians of the Eutaw Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | State | Stratigraphic position | Abundance | Notes | Images |
|
B. sp.[4] |
An eusuchian |
 | ||||
|
D. rugosus?[4] |
An alligatoroid | |||||
|
L. sp.[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 |
|
L. atopus[4] |
A hadrosauromorph dinosaur |
  | ||||
|
Indeterminate |
A pteranodontid pterosaur | |||||
