Ammonites of the Middle Tithonian Internispinosum Zone from Barda Negra, southern Neuquén-Mendoza Basin, Argentina

Parent, Horacio; Scherzinger, Armin; Schweigert, Günter; Capello, Oscar D.

Ammonites of the Middle Tithonian Internispinosum Zone from Barda Negra, southern Neuquén-Mendoza Basin, Argentina

Archivos

BIFG_77_11.pdf (1.36 MB)

Fecha

2007

Autores

Editor

Instituto de Fisiografía y Geología

Resumen

An ammonite fauna from an isolated outcrop of the Upper Jurassic Vaca Muerta Formation is described from Barda Negra in the southern part of the Neuquén-Mendoza Basin. It comprises several macroconch specimens of the species Aspidoceras cf. euomphalum Steuer, 1897 besides macroconchs and microconchs of Windhauseniceras internispinosum (Krantz, 1926), the index species of the Andean Middle Tithonian Internispinosum Zone. Morphological and taxonomic relationships of the studied aspidoceratids with previously described species and the sexual dimorphism in W. internispinosum are discussed.

Palabras clave

Tithonian, Neuquén-Mendoza Basin, Aspidoceras, Windhauseniceras, Sexual Dimorphism, Biostratigraphy, Tithoniano, Cuenca Neuquén-Mendoza, Aspidoceras, Windhauseniceras, Dimorfismo sexual, Bioestratigrafía

Citación

Parent H., Scherzinger A., Schweigert G. & Capello O,D., 2007. Ammonites of the Middle Tithonian Internispinosum Zone from Barda Negra, southern Neuquén-Mendoza Basin, Argentina. Boletín del Instituto de Fisiografía y Geología 77(1-2): 11-24. Rosario, 01-10-2007. ISSN 1666-115X.