Beaver Creek, 42 (Arroyo Formation) (Permian of the United States)

Also known as Locality 42 (Romer 1928), Beaver Creek Wilbarger County, faunal Zone 4, Lower Clear Fork Group, Texas red-beds, redbeds

Where: Wilbarger County, Texas (34.0° N, 99.2° W: paleocoordinates 2.5° N, 28.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Arroyo Formation (Clear Fork Group), Kungurian (279.3 - 272.3 Ma)

• "above the Lueders limestone, and quite probably correspond to the beds to the south of Coffee Creek." Details for Faunal Zone 4 of Romer 1928: "The vertebrate remains are confined to approximately the lowest 250 feet or so of the Clear Fork.."

•the base and top of the Clear Fork Group (i.e., Arroyo, Vale, and Choza formations) are both within the Kungurian: see Wardlaw 2005 (Permophiles) for the base, and DiMichele et al. 2001 (J Paleont) for the top

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; red claystone and conglomeratic sandstone

• "red beds... red clays, with small amounts of sandstone and conglomerates."

Size class: macrofossils

Collection methods: Romer (1928) paper is a review of vertebrates from the Texas red-beds with previously unreported (or undetailed) localities.

Primary reference: A. S. Romer. 1928. Vertebrate faunal horizons in the Texas Permo-Carboniferous red beds. University of Texas Bulletin 2801:67-108 [J. Alroy/R. Whatley/W. Clyde]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 28275: authorized by John Alroy, entered by Robin Whatley on 03.02.2003, edited by Torsten Liebrecht and Emma Dunne

Creative Commons license: CC BY (attribution)

Taxonomic list

 Nectridea - Diplocaulidae
Diplocaulus magnicornis2 Cope 1882 tetrapod
CNHM UC 1013, 1015; assignment to this locality not certain for the latter
 Temnospondyli - Zatracheidae
Zatrachys sp. Cope 1878 tetrapod
 Cotylosauria -
Bathyglyptus theodori n. gen. n. sp.
Bathyglyptus theodori n. gen. n. sp. Case 1911 tetrapod
Incertae sedis (Romer 1928)
 Synapsida - Sphenacodontidae
Dimetrodon sp., "Theropleura grandis n. sp." = Dimetrodon grandis, "Dimetrodon grandis" = Dimetrodon grandis3
Dimetrodon sp. Cope 1878 synapsid
"Theropleura grandis n. sp." = Dimetrodon grandis Case 1907 synapsid
AMNH 4034 (type)
"Dimetrodon grandis" = Dimetrodon grandis3 Case 1907 synapsid
 Recumbirostra - Molgophidae
"Brachydectes elongatus" = Brachydectes newberryi4
"Brachydectes elongatus" = Brachydectes newberryi4 Cope 1868 amniote
UMMP V21485 (skull with postcranial elements, collected by E. C. Case)
 Recumbirostra - Gymnarthridae
"Cardiocephalus sternbergi" = Cardiocephalus sternbergi3, "Gymnarthrus willoughbyi" = Cardiocephalus sternbergi1
"Cardiocephalus sternbergi" = Cardiocephalus sternbergi3 Broili 1904 amniote
"Gymnarthrus willoughbyi" = Cardiocephalus sternbergi1 Broili 1904 amniote
 Cotylosauria - Diadectidae
Diadectes sp.3, "Diadectoides cretin n. gen. n. sp." = Diadectes tenuitectes
Diadectes sp.3 Cope 1878 tetrapod
"Diadectoides cretin n. gen. n. sp." = Diadectes tenuitectes Cope 1896 tetrapod