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Stratigraphic chart of the lower Permian (partial) Content updated October 16, 2005
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RICHARDS SPUR DIAPSID References
Chronological R.L. Carroll (1968) "A ?Diapsid (Reptilia) parietal from the lower Permian of Oklahoma" Postilla 117: 1 - 7 R.R. Reisz (1980) "A protorothyridid captorinomorph reptile from the lower Permian of Oklahoma" Royal Ontario Museum Life Sciences Contributions 121: 1 - 16 R.R. Reisz (1981) "A diapsid reptile from the pennsylvanian of Kansas" Special Publication-University of Kansas Museum of Natural History 7: 1 - 74
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