Valanginian ammonite biostratigraphy of the La Peña del Águila section, Zacatecas State, northern Mexico

• Published in: Cretaceous research Vol. 159; p. 105865
• Main Authors: Ovando-Figueroa, J.R., Jacobo-Delgado, J.A., Company, M., Barragán, R., Ramírez-Peña, C.F., Chávez-Cabello, G., Moreno-Bedmar, J.A.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2024
• Subjects: Biostratigraphy; Correlation; Mediterranean biozonation; Mexico; Valanginian; Mexico; Correlation; Mediterranean biozonation; Valanginian; Biostratigraphy
• ISSN: 0195-6671; 1095-998X
• DOI: 10.1016/j.cretres.2024.105865

An ammonite biostratigraphic analysis was carried out for the La Peña del Águila section, Zacatecas State, northern Mexico, within Valanginian strata of the Taraises Formation. Bed-by-bed sampling yielded 208 ammonites identified in 13 taxa. The biostratigraphic analysis allowed us to identify two ammonite zones: Neocomites neocomiensiformis and Karakaschiceras inostranzewi; and one subzone: Neocomites platycostatus. These biostratigraphic units range within the lower Valanginian. The identified fauna in the La Peña del Águila section has been previously reported in the Mediterranean region. The faunal similarity allows us to employ the Standard Mediterranean Ammonite Scale for the analysis of the current section. This affinity between the Mexican and Mediterranean ammonite faunas could be explained by the proximity and communication between these two areas through the Hispanic corridor during the Valanginian. •208 ammonites of Zacatecas are studied from a biostratigraphic point of view.•The ammonite assemblages range within the lower Valanginian.•Ammonite assemblages of Mexico and Spain are very similar.