Antlers Formation

Antlers Formation
Stratigraphic range: Aptian ~120–112 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Lithology
Primary	Mudstone
Other	Sandstone
Location
Region	Oklahoma,  Texas
Country	United States
Type section
Named by	Robert Thomas Hill[1]

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.

Indeterminate frog remains. Possible indeterminate salamander remains.

Amphibians of the Antlers Formation
Genus	Species	Location	Stratigraphic position	Abundance	Notes	Images
Albanerpeton	Albanerpeton arthridion

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

Chondrichthyans of the Antlers Formation
Genus	Species	Location	Stratigraphic position	Abundance	Notes	Images
Hybodus	Hybodus butleri				Hybodontidae
	?Hybodus sp.
Lissodus	Lissodus anitae				Polyacrodontidae

Possible indeterminate amid remains. Possible indeterminate lepisosteid remains. Possible indeterminate semionotidae remains.

Possible indeterminate deltatheroidan material. Indeterminate multituberculate remains. Indeterminate tribosphenidan remains.

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.

Possible indeterminate scincid remains.

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

Possible indeterminate bird remains are known from the formation.

Saurischians of the Antlers Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Acrocanthosaurus	Acrocanthosaurus atokensis
Astrodon	Astrodon sp.
Deinonychus	Deinonychus antirrhopus
Sauroposeidon	Sauroposeidon proteles			"[Four] cervical vertebrae."[2]

• List of dinosaur-bearing rock formations

• 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.