Las Manuelas I section, level C (Permian of Mexico)

Where: Coahuila, Mexico (26.4° N, 102.9° W: paleocoordinates 1.7° S, 34.6° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Las Delicias Formation, Capitanian (264.3 - 259.5 Ma)

• Brachiopods found suggest a Wordian–Capitanian age for the stratigraphic section studied herein, just as Wardlaw et al. (1979) reported for La Difunta unit. However, the presence of 15 common species with a Capitanian age along with the record of ammonoid Timorites from the upper part of Delaware Mountains and Mexico (Las Delicias Beds) (Miller, 1944; Wardlaw et al., 1979; Leonova, 2002) confirms that rocks of the Las Manuelas I section get a late-middle Permian age (Table 1). The stratigraphic location of the studied section allowed delimiting the age of the upper levels of La Difunta unit (Wardlaw et al., 1979) to the Capitanian.

• bed-level stratigraphic resolution

Environment/lithology: lithified limestone

Size class: macrofossils

Collection methods: Repository: Museo de Paleontología, Facultad de Ciencias, Universidad Nacional Autónoma de México

Primary reference: M. A. Torres-Martínez, D. P. Heredia-Jiménez, S. A. Quiroz-Barroso, P. Navas-Parejo, F. Sour-Tovar and S. A. Quiroz-Barragán. 2019. A Permian (late Guadalupian) brachiopod fauna from northeast Mexico and their paleobiogeographic affinities. Journal of South American Earth Sciences 92:41-55 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 200254: authorized by Matthew Clapham, entered by Matthew Clapham on 24.03.2019

Creative Commons license: CC BY (attribution)

Taxonomic list

Rhynchonellata
 Spiriferida - Martiniidae
 Athyridida - Athyrididae
Composita parasulcata Cooper and Grant 1976
 Athyridida - Neoretziidae
Hustedia opsia Cooper and Grant 1976
Strophomenata
 Productida - Paucispiniferidae
 Productida - Echinoconchidae
 Productida - Strophalosiidae
? Sphenalosia sp. Muir-Wood and Cooper 1960