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Stratigraphic chart of the lower Permian (partial) Content updated October 16, 2005
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Partial stratigraphic chart for the lower Permian of north-central Texas and Southern Oklahoma (from C. Sullivan and R.R. Reisz 1999): REFERENCES
C. Sullivan, R.R. Reisz (1999) " First record of Seymouria (Vertebrata Seymouriamorpha) from the early Permian fissure fills at Richards Spur, Oklahoma". Canadian Journal of Earth Sciences 36: 1257 - 1266
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