Demopolis Chalk
Geological formation in the United States
The Demopolis Chalk is a geological formation in North America, within the U.S. states of Alabama, Mississippi, and Tennessee. The chalk was formed by pelagic sediments deposited along the eastern edge of the Mississippi embayment during the middle Campanian age of the Late Cretaceous. It is a unit of the Selma Group and consists of the upper Bluffport Marl Member and a lower unnamed member. Dinosaur and mosasaur remains are among the fossils that have been recovered from the Demopolis Chalk.
01Vertebrate paleofauna
Fish
Cartilaginous fish
| Cartilaginous fish of the Demopolis Chalk Formation | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Notes | Images |
|
Chimaeriformes indet. |
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|
C. appendiculata |
An otodontid | |||
|
I. mira |
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|
S. texanus |
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|
S. serrata? |
A lamniform shark | |||
|
S. kaupi |
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|
S. pristodontus | ||||
|
S. sp. | ||||
Bony fish
| Bony fish of the Demopolis Chalk Formation | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Notes | Images |
|
E. ferox |
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|
E. gladiolus | ||||
|
E. petrosus | ||||
|
P. sp. |
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|
S. sp. |
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|
S. sp. |
An aulopiform | |||
|
X. vetus |
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Reptiles
Dinosaurs
Indeterminate hadrosaurid remains have been found in Tennessee. Possible indeterminate tyrannosaurid remains have been found in Alabama.
| Dinosaurs of the Demopolis Chalk Formation | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Notes | Images |
|
A. montgomeriensis |
Geographically present in Alabama. |
|||
Crocodylians
| Crocodylians of the Demopolis Chalk Formation | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Notes | Images |
|
B. sp. |
An eusuchian |
|||
Mosasaurs
| Mosasaurs of the Demopolis Chalk | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Notes | Images |
|
C. propython |
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|
H. sp. |
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|
M. conodon |
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|
M. cf. missouriensis | ||||
|
P. cf. somenensis |
Alabama and Mississippi |
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|
P. sp. nov. |
Mississippi | |||
|
T. sp. |
Alabama and Mississippi |
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Turtles
| Turtles of the Demopolis Chalk | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Notes | Images |
|
A. parhami |
Geographically present in Alabama and Mississippi. |
A marine ctenochelyid turtle |
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|
C. barberi |
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|
C. cf. tennuitesta |
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|
P. matutina? |
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|
P. gigas |
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Sources and credits
This article is adapted from the Wikipedia article “Demopolis Chalk”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- Ischyrhiza mira.jpg by Skye McDavid, CC BY-SA 4.0
- ScapanorhynchusCretaceousIsraelTwo.jpg by Wilson44691, Public domain
- Squalicorax2DB.jpg by Creator:Dmitry Bogdanov, CC BY 3.0
- Enchodus petrosus.jpg by Creator: Dmitry Bogdanov, CC BY 3.0
- Protosphyraena2Kansas.jpg by Creator: Dmitry Bogdanov, CC BY 3.0
- Stratodus DB12.jpg by DiBgd, CC BY-SA 4.0
- Appalachiosaurus montgomeriensis.jpg by FunkMonk, CC BY 3.0
- Borealosuchus skull.jpg by Smithsonian Institution, CC BY-SA 4.0
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