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 Introduction

LEPOSPONDYLI

EUREPTILIA

SYNAPSIDA

PARAREPTILIA

DIADECTOMORPHA

ANTHRACOSAUROIDEA

TEMNOSPONDYLI

UNIDENTIFIED TETRAPODS

Stratigraphic chart of the lower Permian (partial)

Phylogenetic Relationships

Content updated October 16, 2005

 

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