Demopolis Chalk

{{Infobox Rockunit

| name = Demopolis Chalk

| image =

| caption =

| type = Geological formation

| age = Upper Cretaceous

| period = Campanian

| prilithology = Chalk

| otherlithology =

| namedfor = Demopolis, Alabama

| namedby =

| region = Alabama, Mississippi, Tennessee

| country = United States

| coordinates =

| unitof = Selma Group

| subunits = Bluffport Marl Member

| underlies = Ripley Formation

| overlies = Mooreville Chalk Formation

| thickness =

| extent =

| area =

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}}

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.{{cite journal | doi = 10.1671/0272-4634(2005)025[0119:ANGASO]2.0.CO;2 | last1 = Carr | first1 = T.D. | last2 = Williamson | first2 = T.E. | last3 = Schwimmer | first3 = D.R. | year = 2005 | title = A new genus and species of tyrannosauroid from the Late Cretaceous (middle Campanian) Demopolis Formation of Alabama | journal = Journal of Vertebrate Paleontology | volume = 25 | issue = 1| pages = 119–143 | s2cid = 86243316 }} It is a unit of the Selma Group and consists of the upper Bluffport Marl Member and a lower unnamed member.{{cite journal |last=Kiernan |first=Caitlin R. |year=2002 |title=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=Journal of Vertebrate Paleontology |volume=22 |issue=1 |pages=91–103 |url=https://www.researchgate.net/publication/254314199 |accessdate=2024-06-12 |doi=10.1671/0272-4634(2002)022[0091:SDAHSO]2.0.CO;2 }} Dinosaur and mosasaur remains are among the fossils that have been recovered from the Demopolis Chalk.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. {{ISBN|0-520-24209-2}}.

Vertebrate paleofauna

=Fish=

==Cartilaginous fish==

class="wikitable" align="center" width="100%"
colspan="5" align="center" \|Cartilaginous fish of the Demopolis Chalk Formation
Genus ! Species ! Presence ! Notes ! Images
Chimaeriformes indet.{{cite journal \|author1=Ikejiri, T. \|author2=Ebersole, J.A. \|author3=Blewitt, H.L. \|author4=Ebersole, S.M. \|year=2013 \|title=An Overview of Late Cretaceous Vertebrates from Alabama \|url=https://www.researchgate.net/publication/272508435 \|journal=Bulletin of the Alabama Museum of Natural History \|volume=31 \|issue=1 \|pages=46–71}} \| \| Alabama \| \| rowspan="99" \| File:Ischyrhiza mira.jpg File:ScapanorhynchusCretaceousIsraelTwo.jpg File:Squalicorax2DB.jpg
Cretolamna \| C. appendiculata \| Alabama \| An otodontid
Ischyrhiza \| I. mira \| Alabama \| A sclerorhynchid
Scapanorhynchus \| S. texanus \| Alabama \| A mitsukurinid
Serratolamna \| S. serrata? \| Alabama \| A lamniform shark
rowspan="3" \| Squalicorax \| S. kaupi \| rowspan="3" \| Alabama \| rowspan="3" \| Anacoracids
S. pristodontus
S. sp.

class="wikitable" align="center" width="100%"

colspan="5" align="center" |Cartilaginous fish of the Demopolis Chalk Formation

Genus

! Species

! Presence

! Notes

! Images

Chimaeriformes indet.{{cite journal |author1=Ikejiri, T. |author2=Ebersole, J.A. |author3=Blewitt, H.L. |author4=Ebersole, S.M. |year=2013 |title=An Overview of Late Cretaceous Vertebrates from Alabama |url=https://www.researchgate.net/publication/272508435 |journal=Bulletin of the Alabama Museum of Natural History |volume=31 |issue=1 |pages=46–71}}

Demopolis Chalk

Vertebrate paleofauna

=Fish=

==Cartilaginous fish==

==Bony fish==

=Reptiles=

==Dinosaurs==

==Crocodylians==

==Mosasaurs==

==Turtles==

See also

References