Bed 9b (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 ferruginous, silty limestone

• None
• Marly-silty intercalations are developed, as well as some silty, ferruginous limestones (stratigraphic interval between Beds 7-9)

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 192469: authorized by Alexis Rojas, entered by Alexis Rojas on 09.04.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Ammonitida - Aspidoceratidae
Schaireria neoburgensis Oppel 1863 ammonite
 Ammonitida - Neocomitidae
Andiceras sp. ammonite
Kossmatia sp. Uhlig 1907 ammonite
 Ammonitida - Ataxioceratidae
Lemencia "sp. A" Donze and Enay 1961 ammonite
 Ammonitida - Perisphinctidae
Subdichotomoceras sp. Spath ammonite
 Phylloceratida - Phylloceratidae
Phylloceras sp. Suess 1865 ammonite