Where: Mexico (23.7° N, 100.9° W: paleocoordinates 19.4° N, 52.5° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: El Verde Member (La Caja Formation), Late/Upper Tithonian (150.8 - 145.0 Ma)

• Although this is one of the few undisturbed sections in the area where the La Caja rests normally on the thick Zuloaga limestones, the La Caja exposure is in large part covered by talus, formed by weathering of the limestones and shales. The fossils mainly occur in this talus. Because of the distinctive lithology and the exposure of the (upper) contact with the Taraises limestones, there is httle doubt that the fossils belong to the El Verde Member. Mixture of Kossmatia-Durangites-Corongoceras assemblage and Substeueroceras-Berriasella assemblage.

• group of beds-level stratigraphic resolution

Environment/lithology: lithified limestone

Size class: macrofossils

Collection methods: surface (float)

• Repository: McMaster University

Primary reference: H. M. Verma and G. E. G. Westermann. 1973. The Tithonian (Jurassic) ammonite fauna of Sierra Catorce, San Luis Potosi, Mexico. Bulletins of American Paleontology 63(277):107-320 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 197729: authorized by Matthew Clapham, entered by Matthew Clapham on 23.11.2018

Creative Commons license: CC BY (attribution)