Andean Lower Tithonian (Picunleufuense Zone) ammonites and aptychus from Estancia Maria Juana, Southern Neuquén Basin, Argentina

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dc.citation.titleBoletín del Instituto de Fisiografía y Geologíaes
dc.citation.volume83es
dc.creatorParent, Horacio
dc.creatorGarrido, Alberto C.
dc.creatorSchweigert, Günter
dc.creatorScherzinger, Armin
dc.date.accessioned2015-07-03T18:46:39Z
dc.date.available2015-07-03T18:46:39Z
dc.date.issued2013-12-27
dc.descriptionThe ammonite fauna of the Lower Tithonian of the locality Estancia María Juana, southern Neuquén Basin is described for first time. The studied material was collected from the Portada Covunco Member (lower part of the Vaca Muerta Formation) which consists of finely sandy shaly marls with large concretions containing abundant crushed ammonites, aptychi, bivalves and gastropods. The ammonites belong to the species Choicensisphinctes choicensis and Lithacoceras picunleufuense transient a, indicating the picunleufuense a Horizon, which is the base of the Lower Tithonian Picunleufuense standard chronostratigraphic Zone. Middle Tithonian ammonites occur as poorly preserved specimens of Catutosphinctes in calcareous sandstones. An aptychus, collected from a concretion, among the bulk of Choicensisphinctes choicensis is of the Praestriaptuchus-type and is concluded it belongs to this ammonite. This association gives additional support to the hypothesis on the origin of Choicensisphinctes from L. picunleufuense in the Late Kimmeridgian or earliest Tithonian. The concretions of the picunleufuense a Horizon are interpreted as late diagenetic, showing that this kind of concretions are among the few marine sedimentary settings where ammonites with their aptychus in-situ could have been preserved.es
dc.description.filFil. Parent, Horacio. Laboratorio de Paleontología, IFG-FCEIA, Universidad Nacional de Rosario, Argentina.es
dc.description.filFil: Garrido, Alberto C. Museo Provincial de Ciencias Naturales “Prof. Dr. Juan A. Olsacher”, Zapala, Neuquén, Argentinaes
dc.description.filFil: Schweigert, Günter. Staatliches Museum für Naturkunde, Stuttgart, Germanyes
dc.description.filFil: Scherzinger, Armin. Eberdingen, Germanyes
dc.formatapplication/pdf
dc.format.extent27-34es
dc.identifier.issn1666-115Xes
dc.identifier.urihttp://hdl.handle.net/2133/4864
dc.language.isoenges
dc.publisherInstituto de Fisiografía y Geología. Facultad de Ciencias Exactas, Ingeniería y Agrimensura. Universidad Nacional de Rosarioes
dc.relation.publisherversionhttp://www.fceia.unr.edu.ar/fisiografia/Vol83.htmes
dc.rightsopenAccesses
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/2.5/ar/*
dc.sourceBoletín del Instituto de Fisiografía y Geología 83es
dc.subjectAmmonoideaes
dc.subjectArgentinaes
dc.subjectTithonianes
dc.subjectPicunleufuense Zonees
dc.subjectPraestriaptychuses
dc.subjectLate diagenetic concretionses
dc.titleAndean Lower Tithonian (Picunleufuense Zone) ammonites and aptychus from Estancia Maria Juana, Southern Neuquén Basin, Argentinaes
dc.typearticle
dc.typeartículo
dc.typepublishedVersion
dc.type.collectionarticulo
dc.type.versionpublishedVersiones

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Año 2013, Boletín IFG vol. 83