Red Beds of Texas and Oklahoma
The Red Beds are a group of Early Permian-age geologic strata in the southwestern United States outcropping in north-central Texas and south-central Oklahoma. They comprise several stratigraphic groups including the Clear Fork Group, the Wichita Group, and the Pearce River Group. The Red Beds were first explored by American paleontologist Edward Drinker Cope starting in 1877. Fossil remains of many Permian tetrapods (four-limbed vertebrates) have been found in the Red Beds, including those of Dimetrodon, Edaphosaurus, Seymouria, and Eryops.
- Lucas, S.G.; Spielmann, J.A.; Rinehart, L.F.; Martens, T. (2009). Dimetrodon (Amniota: Synapsida: Sphenacodontidae) from the Lower Permian Abo Formation, Socorro County, New Mexico (PDF). New Mexico Geological Society Guidebook 60. New Mexico Geological Society. pp. 281–284.
- Bakker, R.T. (26 October 2007). "Texas Red-Beds: World's Largest Dimetrodon Cemetary". Prehistoric CSI. Houston Museum of Natural Science. Retrieved 1 November 2012.
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