Also known as Driver Ranch

Where: Knox County, Texas (33.6° N, 99.9° W)

• Paleocoordinates: 3.3° N, 28.8° W (Wright 2013)

• coordinate estimated from map

• outcrop-level geographic resolution

When: San Angelo Formation (Pease River Group), Kungurian to Kungurian (279.3 - 268.8 Ma)

• "Fossils occur in the upper red shale of the middle San Angelo, in the channel deposits of the upper San Angelo, and in the overlying sandy shales, which, in the proposed scheme, fall in the basal Flower Pot."

•Note: The Middle San Angelo Fm. of Olson's "proposed scheme" is the upper part of the Duncan Sandstone Member of the lower San Angelo Fm. and Olson's upper San Angelo Fm. and basal Flower Pot Fm. belong to the Flowerpot Shale Member of the upper San Angelo Fm. (see Smith, 1974, University of Texas Bureau of Economic Geology, Report of Investigations No. 80). More recently, the age of the San Angelo Formation was reassessed using multiple methods, which suggest a latest Kungurian to (more likely) early Roadian age. See: Laurin, M., & Hook, R. (2022). The age of North America’s youngest Paleozoic continental vertebrates: a review of data from the Middle Permian Pease River (Texas) and El Reno (Oklahoma) Groups. Bulletin de la Société Géologique de France, 193(10), 1-30. https://doi.org/10.1051/bsgf/2022007 (open access).

• formation-level stratigraphic resolution

Environment/lithology: fluvial-deltaic; green, red shale and sandstone

Size class: macrofossils

Primary reference: E. C. Olson. 1962. Late Permian terrestrial vertebrates, U.S.A. and U.S.S.R. Transactions of the American Philosophical Society, New Series 52(2):1-224 [J. Mueller/J. Dummasch/T. Liebrecht]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 85170: authorized by Johannes Mueller, entered by Torsten Liebrecht on 04.12.2008

Creative Commons license: CC0 (CC0)