El Reno Group Explained

El Reno Group
Type:	Group
Age:	Permian
Region:	Oklahoma
Country:	United States

The El Reno Group is a geologic group in Oklahoma. It preserves fossils dating back to the Permian period. The Chickasha Formation, which is part of this group, contains the geologically most recent Permian continental vertebrates (Roadian) known from North America.^[1] These include one of the most recent lepospondyls,^[2] a dissorophoid,^[3] and some fragmentary fossils of Steppesaurus that Everett C. Olson interpreted as one of the oldest known therapsids,^[4] an interpretation that has not been widely accepted.

See also

• List of fossiliferous stratigraphic units in Oklahoma
• Paleontology in Oklahoma

References

• Web site: Fossilworks: Gateway to the Paleobiology Database. ((Various Contributors to the Paleobiology Database)). 17 December 2021.

Notes and References

1. Laurin . Michel . Hook . Robert W. . The age of North America’s youngest Paleozoic continental vertebrates: a review of data from the Middle Permian Pease River (Texas) and El Reno (Oklahoma) Groups . BSGF - Earth Sciences Bulletin . 2022 . 193 . 10 . 10.1051/bsgf/2022007 . 1777-5817.
2. Olson . Everett C. . Diplocaulus parvus n. sp. (Amphibia: Nectridea) from the Chickasha Formation (Permian: Guadalupian) of Oklahoma . Journal of Paleontology . 1972 . 46 . 5 . 656–659 . 0022-3360.
3. Olson . Everett C. . Fayella chickashaensis, the Dissorophoidea and the Permian Terrestrial Radiations . Journal of Paleontology . 1972 . 46 . 1 . 104–114 . 0022-3360.
4. Olson . Everett C. . Late Permian Terrestrial Vertebrates, U. S. A. and U. S. S. R. . Transactions of the American Philosophical Society . 1962 . 52 . 2 . 1–224 . 10.2307/1005904 . 0065-9746.