It preserves fossils dating back to the Permian period.
The Chickasha Formation, which is part of this group, contains the geologically most recent Permian continental vertebrates (Roadian) known from North America.
[1] These include one of the most recent lepospondyls,[2] a dissorophoid,[3] and some fragmentary fossils of Steppesaurus that Everett C. Olson interpreted as one of the oldest known therapsids,[4] an interpretation that has not been widely accepted.
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