# 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).
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.

## Amphibians

Indeterminate frog remains. Possible indeterminate salamander remains.
Amphibians of the Antlers Formation :
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | Images |
| Albanerpeton | Albanerpeton arthridion | | | | | Albanerpeton |

## Fish

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 | Notes | Images |
| Hybodus | Hybodus butleri | Hybodontidae | Hybodus |
| Hybodus | ?Hybodus sp. | | Hybodus |
| Lissodus | Lissodus anitae | Polyacrodontidae | Hybodus |

### 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 | Gyronchus dumblei | | | | |
| ?Palaeobalistum | ?Palaeobalistum sp. | | | | |

## Mammals

Possible indeterminate deltatheroidan material. Indeterminate multituberculate remains. Indeterminate tribosphenidan remains.
Mammals of the Antlers Formation :
| Genus | Species |
| Astroconodon | Astroconodon sp. |
| Atokatheridium | Atokatheridium boreni |
| ?Paracimexomys | Paracimexomys crossi |

## Reptiles
### 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 |
| Bernissartia | Bemissartia sp. | | | | | Bernissartia |

### Lepidosaurs

Possible indeterminate scincid remains.
Lepidosaurs of the Antlers Formation :
| Genus | Species | Location | Stratigraphic position | Abundance | Notes |
| Atokasaurus | Atokasaurus metarsiodon | | | | |
| Ptilotodon | Ptilotodon wilsoni | | | | |

### Ornithischians

Ornithischians of the Antlers Formation :
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | Images |
| Tenontosaurus | Tenontosaurus sp. | | | | | Tenontosaurus |

### Saurischians

Possible indeterminate bird remains are known from the formation.
Saurischians of the Antlers Formation :
| Genus | Species | Material | Images |
| Acrocanthosaurus | Acrocanthosaurus atokensis | | Acrocanthosaurus Astrodon Deinonychus Sauroposeidon |
| Astrodon | Astrodon sp. | | Acrocanthosaurus Astrodon Deinonychus Sauroposeidon |
| Deinonychus | Deinonychus antirrhopus | | Acrocanthosaurus Astrodon Deinonychus Sauroposeidon |
| Sauroposeidon | Sauroposeidon proteles | "[Four] cervical vertebrae." | Acrocanthosaurus Astrodon Deinonychus Sauroposeidon |

### Turtles

Turtles of the Antlers Formation :
| Genus | Species | Location | Stratigraphic position | Abundance | Notes |
| ?Glyptops | Glyptops sp. | | | | |
| Naomichelys | Naomichelys sp. | | | | |