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Stratigraphic chart of the lower Permian (partial) Content updated October 16, 2005
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DIMETRODON References
Chronological A.S. Romer, L.I. Price (1940) "Review of the Pelycosauria". Geological Society of America, Special Papers 28: 1 - 538 R.R. Reisz (1986) " Pelycosauria" in Encyclopedia of Paleoherpetology, Part 17A (P. Wellnhofer, ed.) , Gustav Fischer Verlag, Stuttgart: 1 - 102
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