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Stratigraphic chart of the lower Permian (partial) Content updated October 16, 2005
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SULLIVAN ET AL. RICHARDS SPUR NEW DISSOROPHOID References
C. Sullivan, R.R. Reisz, W. J. May (2000) "Large dissorophoid skeletal elements from the lower permian Richards Spur fissures, Oklahoma, and their paleoecological implications". Journal of Vertebrate Paleontology 20 (3): 456 - 461. |