Antlers_Formation
The Antlers Formation is a stratum which ranges from Arkansas through southern Oklahoma into northeastern Texas. The stratum is 150 m (490 ft) thick consisting of silty to sandy mudstone and fine to coarse grained sandstone that is poorly to moderately sorted. The stratum is cemented with clay and calcium carbonate. In places the sandstone may be conglomeratic or ferruginous (rich in iron oxides).
| Antlers Formation | |
|---|---|
| Stratigraphic range: Aptian ~120β112 Ma | |
| Type | Geological formation |
| Lithology | |
| Primary | Mudstone |
| Other | Sandstone |
| Location | |
| Region |  Oklahoma,  Texas |
| Country |  United States |
| Type section | |
| Named by | Robert Thomas Hill[1] |
Based on correlation with the Trinity Group of Texas, the Antlers Formation is estimated to be late Aptian-early Albian. This age range is supported by the presence of two dinosaurs that are also known from the Cloverly Formation, Deinonychus and Tenontosaurus.
Indeterminate frog remains. Possible indeterminate salamander remains.
| Amphibians of the Antlers Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | Images |
|
Albanerpeton arthridion |
 | |||||
References: Cifelli et al. 1999; Wedel et al. 2000, Kielan-Jarorowska and Cifelli 2001; Nydam and Cifelli 2002.
Cartilaginous fish
| Chondrichthyans of the Antlers Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | Images |
|
Hybodus butleri |
Hybodontidae |
| ||||
|
?Hybodus sp. |
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|
Lissodus anitae |
Polyacrodontidae | |||||
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Ray-finned fish
Possible indeterminate amid remains. Possible indeterminate lepisosteid remains. Possible indeterminate semionotidae remains.
| Actinopterygians of the Antlers Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | |
|
Gyronchus dumblei |
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|
?Palaeobalistum sp. |
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Possible indeterminate deltatheroidan material. Indeterminate multituberculate remains. Indeterminate tribosphenidan remains.
| Mammals of the Antlers Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | |
|
Astroconodon sp. |
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|
Atokatheridium boreni |
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|
Paracimexomys crossi |
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Crurotarsans
Possible indeterminate atoposaurid remains. Possible indeterminate goniopholidid remains. Possible indeterminate pholidosaurid remains.
| Crurotarsans of the Antlers Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | Images |
|
Bemissartia sp. |
| |||||
Lepidosaurs
Possible indeterminate scincid remains.
| Lepidosaurs of the Antlers Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | |
|
Atokasaurus metarsiodon |
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|
Ptilotodon wilsoni |
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Ornithischians
| Ornithischians of the Antlers Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | Images |
|
Tenontosaurus sp. |
| |||||
Saurischians
Possible indeterminate bird remains are known from the formation.
| Saurischians of the Antlers Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
|
Acrocanthosaurus atokensis |
| |||||
|
Astrodon sp. |
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|
Deinonychus antirrhopus |
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|
Sauroposeidon proteles |
"[Four] cervical vertebrae."[2] |
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Turtles
| Turtles of the Antlers Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | |
|
Glyptops sp. |
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|
Naomichelys sp. |
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- Cifelli, R. Gardner, J.D., Nydam, R.L., and Brinkman, D.L. 1999. Additions to the vertebrate fauna of the Antlers Formation (Lower Cretaceous), southeastern Oklahoma. Oklahoma Geology Notes 57:124-131.
- Nydam, R.L. and R. L. Cifelli. 2002a. Lizards from the Lower Cretaceous (Aptian-Albian) Antlers and Cloverly formations. Journal of Vertebrate Paleontology. 22:286β298.
- Kielan-Jarorowska, Z., and Cifelli, R.L. 2001. Primitive boreosphenidan mammal (?Deltatheroida) from the Early Cretaceous of Oklahoma. Acta Palaeontologica Polonica 46: 377-391.
- Wedel, M.J., Cifelli, R.L., and Sanders, R. K. 2000. Sauroposeidon Proteles, A new sauropod from the Early Cretaceous of Oklahoma. Journal of Vertebrate Paleontology 20:109-114.