Also known as MacFayden Ranch; Swanson Quarry

Where: Knox County, Texas (33.7° N, 100.0° W)

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

• coordinate estimated from map

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

• Middle and Upper San Angelo Formation sensu Olson (1962), corresponding to the upper Duncan Sandstone Member and lower Flowerpot Shale Member of the San Angelo Formation sensu Smith (1974). 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).

• member-level stratigraphic resolution

Environment/lithology: "floodplain"; red, sandy shale and conglomerate

Size class: macrofossils

Reposited in the FMNH

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 80689: authorized by Johannes Mueller, entered by Jana Dummasch on 05.05.2008, edited by Torsten Liebrecht

Creative Commons license: CC0 (CC0)