Bed 1 (Jurassic of Mexico)

Where: San Luis Potosí , Mexico (23.6° N, 100.9° W: paleocoordinates 18.7° N, 51.6° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: El Pastor Member (La Caja Formation), Early/Lower Kimmeridgian (155.7 - 150.8 Ma)

Environment/lithology: lithified marl and silty claystone

• None
• Marls and silty clays with three interbeds of marly-silty limestone (Beds 1a-4a)

Size class: macrofossils

Preservation: cast, mold/impression

Collection methods: quarrying,

Primary reference: F. Olóriz, A. B. Villaseñor, C. Gonzalez-Arreola and G. E. G. Westermann. 1999. Ammonite Biostratigraphy and Correlations in the Upper Jurassic-Lowermost Cretaceous La Caja Formation of North-Central Mexico (Sierra de Catorce, San Luis de Potosí). In F. Olóriz, F. J. Rodríguez-Tovar (eds.), Advancing Research on Living and Fossil Cephalopods 550 [A. Rojas/A. Rojas]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 192459: authorized by Alexis Rojas, entered by Alexis Rojas on 09.04.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Ataxioceratidae
Orthosphinctes ? sp.
Orthosphinctes ? sp. Schindewolf 1925 ammonite
 Ammonitida - Perisphinctidae
Crussoliceras sp.
Crussoliceras sp. Enay 1959 ammonite
 Ammonitida - Aspidoceratidae
Physodoceras sp., Orthaspidoceras sp.
Physodoceras sp. Hyatt 1900 ammonite