Demopolis Chalk
| Demopolis Chalk | |
|---|---|
| Stratigraphic range: Upper Cretaceous | |
| Type | Geological formation |
| Unit of | Selma Group |
| Sub-units | Bluffport Marl Member |
| Underlies | Ripley Formation |
| Overlies | Mooreville Chalk Formation |
| Lithology | |
| Primary | Chalk |
| Location | |
| Region | Alabama, Mississippi, Tennessee |
| Country | United States |
| Type section | |
| Named for | Demopolis, Alabama |
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.[1] It is a unit of the Selma Group and consists of the upper Bluffport Marl Member and a lower unnamed member.[2] Dinosaur and mosasaur remains are among the fossils that have been recovered from the Demopolis Chalk.[2][3]
Vertebrate paleofauna
[edit | edit source]Fish
[edit | edit source]Cartilaginous fish
[edit | edit source]| Cartilaginous fish of the Demopolis Chalk Formation | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Notes | Images |
|
Chimaeriformes indet.[4] |
 | |||
|
An otodontid | ||||
|
S. texanus[4] |
||||
|
S. serrata?[4] |
A lamniform shark | |||
|
S. kaupi[4] |
||||
|
S. sp.[4] | ||||
Bony fish
[edit | edit source]| Bony fish of the Demopolis Chalk Formation | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Notes | Images |
|
E. ferox[4] |
| |||
|
E. gladiolus[4] | ||||
|
E. petrosus[4] | ||||
|
P. sp.[4] |
||||
|
S. sp.[4] |
||||
|
S. sp.[4] |
An aulopiform | |||
|
X. vetus[5] |
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Reptiles
[edit | edit source]Dinosaurs
[edit | edit source]Indeterminate hadrosaurid remains have been found in Tennessee.[3] Possible indeterminate tyrannosaurid remains have been found in Alabama.[3]
| Dinosaurs of the Demopolis Chalk Formation | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Notes | Images |
|
| ||||
Crocodylians
[edit | edit source]| Crocodylians of the Demopolis Chalk Formation | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Notes | Images |
|
B. sp.[4] |
An eusuchian |
| ||
Mosasaurs
[edit | edit source]| Mosasaurs of the Demopolis Chalk | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Notes | Images |
|
C. propython[4] |
| |||
|
H. sp.[4] |
||||
|
M. cf. missouriensis[4] | ||||
|
P. cf. somenensis[4] |
||||
|
P. sp. nov.[7] |
Mississippi[6] | |||
|
T. sp.[4] |
||||
Turtles
[edit | edit source]| Turtles of the Demopolis Chalk | ||||
|---|---|---|---|---|
| Genus | Species | Presence | Notes | Images |
|
A. parhami[8] |
Geographically present in Alabama and Mississippi.[8] |
A marine ctenochelyid turtle |
| |
|
C. barberi[4] |
||||
|
C. cf. tennuitesta[4] |
||||
|
P. matutina?[4] |
||||
|
P. gigas[4] |
||||
See also
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References
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- ^ a b c d e f Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d e f Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, North America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 574-588. Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value)..
- ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap aq ar as Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).