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Año 2007, Boletín IFG vol. 77, números 1 - 2

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https://rephip.unr.edu.ar/handle/2133/965

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Examinando Año 2007, Boletín IFG vol. 77, números 1 - 2 por Autor "Parent, Horacio"

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  • Miniatura
    ÍtemAcceso Abierto
    Ammonites of the Middle Tithonian Internispinosum Zone from Barda Negra, southern Neuquén-Mendoza Basin, Argentina
    (Instituto de Fisiografía y Geología, 2007) Parent, Horacio; Scherzinger, Armin; Schweigert, Günter; Capello, Oscar D.
    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.
  • Miniatura
    ÍtemAcceso Abierto
    The Tithonian (Upper Jurassic) ammonite succession at Portada Covunco, Neuquén-Mendoza Basin, Argentina
    (Instituto de Fisiografía y Geología, 2007) Parent, Horacio; Cocca, Sergio Eduardo
    The Tithonian rock succession (Vaca Muerta Fm.) of Portada Covunco consists of a lower part of little more than 100 m of shales and shaly limestones with ammonites of the genera “Lithacoceras”, Choicensisphinctes and Pseudolissoceras of the Mendozanus and Zitteli zones; the middle part consists of about 160 m of limestones and marly limestones with ammonites of the genera Aspidoceras and Catutosphinctes of the Proximus? and Internispinosum zones; ending with some 45 m of unfossiliferous mudstones and shaly marls. Catutosphinctes Leanza & Zeiss (Ataxioceratidae: Torquatisphinctinae), a genus widely distributed through all the Tithonian of the southern Neuquén-Mendoza Basin, occurs through the more calcareous upper part of the section, mainly the type species Catutosphinctes rafaeli Leanza & Zeiss.