Antlers Formation

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The Antlers Formation occurs as a band of strata from Arkansas through southern Oklahoma into northeastern Texas. It consists of 150 m of silty to sandy mudstones, fine- to coarse grained sandstones that are poorly to moderately sorted and cemented with clay or calcium carbonate. In places the sandstone may be conglomeratic or ferruginous.

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.

[edit] Vertebrate fauna

Chondrichthyes Hybodontiformes Hybodontidae Hybodus buderi ?Hybodus sp. Polyacrodontidae Lissodus anitae Ostelchthyes ?Semionotiformes ?Semionoddae genus and species indeterminant ?Lepisosteiformes ?Lepisosteidae genus and species indeterminant Pycnodontiformes Pycnodontidae ?Palaeobalistum sp. Gyronchus dumblei Amiiformes ?Amiidae genus and species indeterminant Lissamphibia Order uncertain Albanerpetontidae Albanerpeton arthridion ?Caudata, family indeterminant genus and species indeterminant Anura Family indeterminant genus and species indeterminant Reptllia Chelonia Family indeterminant genus and species indeterminant Pleurostemidae Naomichelys sp. Glyptopsidae ?Glyptops sp. Squamata ?Paramacellodidae Atokasaurus metarsiodon Teiidae Ptilotodon wilsoni ?Scincidae genus and species indeterminant

Crocodilia Bemissartiidae Bemissartia sp. ?Atoposauridae genus and species indeterminant ?Goniopholidae genus and species indeterminant ?Pholidosauridae genus and species indeterminant Dinosauria Saurischia Sauropoda Brachiosauridae Sauroposeidon proteles Astrodon sp. Theropoda Family indeterminant genus and species indeterminant Allosauridae Acrocanthosaurus atokensis Dromaeosauridae Deinonychus cf. D. antirrhopus ?Aves Family indeterminant genus and species indeterminant Ornithischia Ornithopoda Iguanodontidae Tenontosaurus sp. Mammalia Triconodonta Triconodontidae Astroconodon cf. A. denisoni Multituberculata Family uncertain ?Paracimexomys crossi genus and species indeterminant Tribosphenida Family indeterminant genus and species indeterminant ?Deltatheroida Family indeterminant Atokatherium boreni

references: Cifelli et al. 1999; Wedel et al. 2000, Kielan-Jarorowska and Cifelli 2001; Nydam and Cifelli 2002.

[edit] References

• 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.