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

Files

BIFG_77_11.pdf (1.36 MB)

Date

2007

Authors

Publisher

Instituto de Fisiografía y Geología

Abstract

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.

Keywords

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

Citation

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.