Dimetrodon (amniota: synapsida: sphenacodontidae) from the lower permina Abo Formation, Socorro County, New Mexico
— Spencer G. Lucas, Justin A. Spielmann, Larry F. Rinehart, and Thomas Martens
We document dorsal vertebrae and neural spine fragments of a small specimen of Dimetrodon, NMMNH P-57872, from the middle part of the Lower Permian Abo Formation in Socorro County, New Mexico. This adds to the relatively few records of Dimetrodon outside of Texas and Oklahoma and is the only Early Permian locality that yields the taxon in Socorro County. The locality is approximately 140 km from the nearest Early Permian marine shoreline and near the flanks of the Joyita uplift of the ancestral Rocky Mountain orogeny, so it is consistent with Dimetrodon having been a fully terrestrial, inland predator. Nevertheless, its rarity outside of Texas and Oklahoma cannot be readily explained.
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- Lucas, Spencer G.; Spielmann, Justin A.; Rinehart, Larry F.; Martens, Thomas, 2009, Dimetrodon (amniota: synapsida: sphenacodontidae) from the lower permina Abo Formation, Socorro County, New Mexico, in: Geology of the Chupadera Mesa, Lueth, Virgil W.; Lucas, Spencer G.; Chamberlin, Richard M., New Mexico Geological Society, Guidebook, 60th Field Conference, pp. 281-284.