Where: Hidalgo, Mexico (23.8° N, 99.3° W: paleocoordinates 4.5° S, 40.0° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Guacamaya Formation, Sakmarian to Sakmarian (293.5 - 279.3 Ma)

• able to be assigned to the Wolfcamp and possibly the Leonard

• formation-level stratigraphic resolution

Environment/lithology: lithified, black, gray, green mudstone and siltstone

Size class: macrofossils

Preservation: adpression

Collection methods: quarrying, surface (in situ), mechanical,

Primary reference: J. Carrillo Bravo. 1965. Estudio geologico de una parte del anticlinorio de Huayacocotla. Bulletin of the Mexican Association of Petroleum Geologists 17:73-96 [A. Rees/D. Sunderlin/D. Sunderlin]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 23179: authorized by Allister Rees, entered by Dave Sunderlin on 10.07.2002

Creative Commons license: CC BY (attribution)