La Peña del Águila section, bed 109 (Cretaceous of Mexico)

Where: Zacatecas, Mexico (24.6° N, 101.6° W)

• Paleocoordinates: 21.0° N, 42.3° W (Wright 2013)

• coordinate stated in text

• outcrop-level geographic resolution

When: Karakaschiceras inostranzewi ammonoid zone, Taraises Formation, Early/Lower Valanginian (140.2 - 136.4 Ma)

• Neocomites platycostatus subzone

• bed-level stratigraphic resolution

Environment/lithology: lithified, argillaceous limestone

• The color of the limestones ranges from light grey to bluish grey and light brown. The limestones also contain pyrite, either in the form of small nodules or disseminated. Upon weathering, this presence gives a reddish-brown to ocher color to the rock.

Size class: macrofossils

Preservation: mold/impression

Collection methods: Repository: Museo María del Carmen Perrilliat M., Colección Nacional de Paleontología, Instituto de Geología, UNAM, Ciudad de México, México (catalogued with IGM numbers)

Primary reference: J. R. Ovando-Figueroa, J. A. Jacobo-Delgado, M. Company, R. Barragán, C. F. Ramírez-Peña, G. Chávez-Cabello, and J. A. Moreno-Bedmar. 2024. Valanginian ammonite biostratigraphy of the La Peña del Águila section, Zacatecas State, northern Mexico. Cretaceous Research 159(105865) [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 235609: authorized by Matthew Clapham, entered by Matthew Clapham on 19.07.2024

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Olcostephanidae
Valanginites nucleus
Valanginites nucleus Roemer 1841 ammonite