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Delorhynchus (Bolterpeton) Jaw Section, Permian

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0.6" (1.56 cm) Delorhynchus (Bolterpeton) jaw section from the Texas Red Beds of Archer County, Texas. From the Permian period, this synapsid is about 287 million years old. Delorhynchus is a parareptile, which is an extinct branch of reptiles.