Chickasha Formation

Last updated
Chickasha Formation
Stratigraphic range: Roadian
Type Formation
Location
Region Oklahoma
Country United States
Type section
Named for Chickasha, Grady County, Oklahoma
Named byCharles Newton Gould, 1924 [1]

The Chickasha Formation, which is part of the El Reno Group, is a geologic formation in Oklahoma. It preserves fossils dating back to the Roadian stage of the Middle Permian. [2] These include, among others, the dissorophoid temnospondyl Nooxobeia gracilis, [3] the lepospondyl Diplocaulus parvus (Amphibia: Nectridea), [4] and the captorhinid Rothianiscus robusta, initially called Rothia robusta by Everett C. Olson. [5] Many of these fossils were indicated to have come from the Flowerpot Shale, but these actually come from the Chickasha Formation, according to the current nomenclature. [6] The age of the formation was long debated because Olson based part of his argument on fragmentary fossils that he interpreted as therapsids, an interpretation that was not widely accepted. [7] Worse, one of them, Watongia , [8] was later shown to be a varanopid. [9]

See also

References

  1. ↑ Gould, Charles N. (1924). "A new classification of the Permian redbeds of southwestern Oklahoma". American Association of Petroleum Geologists Bulletin. 8 (3): 322–341.
  2. ↑ Laurin, Michel; Hook, Robert W. (2022). "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. 193: 10. doi: 10.1051/bsgf/2022007 . ISSN   1777-5817.
  3. ↑ Gee, Bryan M.; Scott, Diane; Reisz, Robert R. (October 2018). "Reappraisal of the Permian dissorophid Fayella chickashaensis". Canadian Journal of Earth Sciences. 55 (10): 1103–1114. doi:10.1139/cjes-2018-0053.
  4. ↑ Olson, Everett C. (1972). "Diplocaulus parvus n. sp. (Amphibia: Nectridea) from the Chickasha Formation (Permian: Guadalupian) of Oklahoma". Journal of Paleontology. 46 (5): 656–659. ISSN   0022-3360.
  5. ↑ Olson, E. C. (1965). "New Permian Vertebrates from the Chickasha Formation in Oklahoma". New Permian Vertebrates from the Chickasha Formation in Oklahoma. 70: 1–70.
  6. ↑ Smith, Gary E. (1974). "Depositional systems, San Angelo Formation (Permian), north Texas--facies control of red-bed copper mineralization". Report of Investigations, Bureau of economic geology. 80: 73. doi:10.26153/tsw/4807.
  7. ↑ Olroyd, Savannah L.; Sidor, Christian A. (1 August 2017). "A review of the Guadalupian (middle Permian) global tetrapod fossil record". Earth-Science Reviews. 171: 583–597. doi:10.1016/j.earscirev.2017.07.001. ISSN   0012-8252.
  8. ↑ Olson, E.C. (1974). "On the Source of Therapsids". Annals of the South African Museum. 64: 27–46.
  9. ↑ Reisz, Robert R; Laurin, Michel (1 April 2004). "A reevaluation of the enigmatic Permian synapsid Watongia and of its stratigraphic significance" . Canadian Journal of Earth Sciences. 41 (4): 377–386. doi:10.1139/e04-016. ISSN   0008-4077.


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