The Red Beds of Texas and Oklahoma are a group of Early Permian-age geologic strata in the southwestern United States cropping out in north-central Texas and south-central Oklahoma. They comprise seve
Artist's rendering of Edaphosaurus pogonias and Platyhystrix
Edaphosaurus boanerges fossil skeleton from Archer County, on display in Harvard Museum of Natural History
Seymouria baylorensis skeleton
Dimetrodon
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Dimetrodon is an extinct genus of sphenacodontid synapsid that lived during the Cisuralian to early Guadalupian epoch of the Permian period, around 294.1–271 million years ago. With most species measu
Red Beds of Texas and Oklahoma
…Drinker Cope starting in 1877. Fossil remains of many Permian tetrapods (four-limbed vertebrates) have been found in the Red Beds, including those of Dimetrodon, Edaphosaurus, Seymouria, Platyhystrix, and Eryops. A recurring feature in many of these animals is the sail structure on their backs. Deposits dating…
Dimetrodon incisivum 01
Maxilla of Dimetrodon borealis, the first Dimetrodon fossil to be described
Restoration of Dimetrodon and Edaphosaurus (background), Charles R. Knight, 1897
Restoration of D. giganhomogenes with exposed neural spine tips