Las Manuelas I section, level B (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 200253: authorized by Matthew Clapham, entered by Matthew Clapham on 24.03.2019

Creative Commons license: CC BY (attribution)

Taxonomic list

Strophomenata
 Productida - Aulostegidae
Ramavectus sp. Stehli 1954
? Edriosteges sp. Muir-Wood and Cooper 1960
 Productida - Paucispiniferidae
? Anemonaria sp. Cooper and Grant 1969
 Productida -
Probolionia sp. Cooper 1957
 Productida - Echinoconchidae
 Productida - Linoproductidae
Grandaurispina cf. bella Cooper and Grant 1975
 Orthotetida - Derbyiidae
? Derbyia sp. Waagen 1884
 Orthotetida - Meekellidae
Rhynchonellata
 Spiriferida - Spiriferellidae
Spiriferella sulcifer Shumard 1858
 Athyridida - Athyrididae
Composita affinis Girty 1908
Composita parasulcata Cooper and Grant 1976
Composita cf. prospera Cooper and Grant 1976
Cleiothyridina sp. Buckman 1906
 Athyridida - Neoretziidae
Hustedia stataria Cooper and Grant 1976
Hustedia opsia Cooper and Grant 1976
 Spiriferinida - Reticulariinidae
Reticulariina laxa Girty 1908
 Rhynchonellida - Rhynchoporidae
Rhynchopora guadalupensis Cooper and Grant 1976
 Rhynchonellida - Wellerellidae
Wellerella girtyi Cooper and Grant 1976
 Terebratulida - Dielasmatidae
 Orthida - Enteletidae