The Antlers Formation is a stratum which ranges from Arkansas through southern Oklahoma into northeastern Texas. The stratum is 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 ImagesAlbanerpetonAlbanerpeton arthridion
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 Location Stratigraphic position Abundance Notes ImagesHybodusHybodus butleri Hybodontidae?Hybodus sp.LissodusLissodus anitae Polyacrodontidae
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 NotesGyronchusGyronchus dumblei?Palaeobalistum?Palaeobalistum sp.
Mammals Possible indeterminate deltatheroidan material. Indeterminate multituberculate remains. Indeterminate tribosphenidan remains.
Mammals of the Antlers Formation Genus Species Location Stratigraphic position Abundance NotesAstroconodonAstroconodon sp.AtokatheridiumAtokatheridium boreni?ParacimexomysParacimexomys 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 ImagesBernissartiaBemissartia sp.
Lepidosaurs Possible indeterminate scincid remains.
Lepidosaurs of the Antlers Formation Genus Species Location Stratigraphic position Abundance NotesAtokasaurusAtokasaurus metarsiodonPtilotodonPtilotodon wilsoni
Ornithischians Ornithischians of the Antlers Formation Genus Species Location Stratigraphic position Abundance Notes ImagesTenontosaurusTenontosaurus sp.
Saurischians Possible indeterminate bird remains are known from the formation.
Saurischians of the Antlers Formation Genus Species Location Stratigraphic position Material Notes ImagesAcrocanthosaurusAcrocanthosaurus atokensisAstrodonAstrodon sp.DeinonychusDeinonychus antirrhopus SauroposeidonSauroposeidon proteles"[Four] cervical vertebrae.""Table 13.1," in Weishampel, et al. (2004). Page 267.
Turtles
Turtles of the Antlers Formation Genus Species Location Stratigraphic position Abundance Notes Images?GlyptopsGlyptops sp.NaomichelysNaomichelys sp.
See also List of dinosaur-bearing rock formations
References
Further reading 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. 22:286–298. 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.