Where: Coahuila de Zaragoza, Mexico (27.8° N, 101.9° W: paleocoordinates 26.8° N, 57.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: La Péna Formation, Late/Upper Aptian (122.5 - 113.0 Ma)

• STRATIGRAPHIC RELATIONS: From the La Péna Fm, which overlies the Cupido Fm. AGE: Late Aptian, on the basis of ammonoid biostratigraphy. STRATIGRAPHIC POSITION: From unknown part of the formation.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified limestone and lithified, calcareous marl

Size class: macrofossils

Preservation: mold/impression

Collection methods: surface (in situ),

• COLLECTOR: Unknown. REPOSITORY: Unknown.

Primary reference: A. Cantu-Chapa. 1962. Étude biostratigraphique des Ammonites (Jurassique supérieur et Crétacé) du Mexique (Centre et Nord). Unpublished PhD thesis, A la Faculté des Sciences de L'Université de Paris 1-103 [A. Hendy/A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 89547: authorized by Austin Hendy, entered by Austin Hendy on 01.06.2009

Creative Commons license: CC BY (attribution)