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Stratigraphic chart of the lower Permian (partial) Content updated October 16, 2005
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RICHARDS SPUR THRAUSMOSAURUS References
Chronological R.C. Fox (1962) "Two new Pelycosaurs from the lower Permian of Oklahoma". University of Kansas Publications of the Museum of Natural History 12: 297 - 307 R.R. Reisz, H. Wilson, D. Scott (1997) " Varanopseid synapsid skeletal elements from Richards Spur, a lower Permian fissure fill near Fort Sill, Oklahoma. Oklahoma Geology Notes 57: 160 - 170 C. Sullivan, R.R. Reisz (1999) "First Record of Seymouria (Vertebrata: Seymouriamorpha) from early Permian fissure fills at Richards Spur, Oklahoma". Canadian Journal of Earth Sciences 36: 1257 - 1266
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