Where: Guerrero, Mexico (17.8° N, 98.7° W: paleocoordinates 6.2° S, 42.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Olinalá Formation, Guadalupian (273.0 - 259.5 Ma)

• Also called "Los Arcos" formation

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified siltstone

Size class: macrofossils

Collection methods: Repository: Instituto de Geología, UNAM (IGM)

Primary reference: C. González-Arreola, A. B. Villaseñor-Martínez, and R. Corona-Esquivel. 1994. Permian fauna of the Los Arcos Formation, Municipality of Olinalá, State of Guerrero, Mexico. Revista Mexicana de Ciencias Geológicas 11:214-221 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 232710: authorized by Matthew Clapham, entered by Matthew Clapham on 24.12.2023

Creative Commons license: CC BY (attribution)