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

The 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 concr...

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Autores principales: Parent, Horacio, Garrido, Alberto C., Schweigert, Günter, Scherzinger, Armin
Formato: article artículo publishedVersion
Lenguaje:Inglés
Publicado: Instituto de Fisiografía y Geología. Facultad de Ciencias Exactas, Ingeniería y Agrimensura. Universidad Nacional de Rosario 2015
Materias:
Ammonoidea
Argentina
Tithonian
Picunleufuense Zone
Praestriaptychus
Late diagenetic concretions
Acceso en línea:http://hdl.handle.net/2133/4864
http://hdl.handle.net/2133/4864
Aporte de:
Repositorio Hipermedial de la Universidad Nacional de Rosario (UNR) de Universidad Nacional de Rosario
id I15-R121-2133-4864
record_format dspace
institution Universidad Nacional de Rosario
institution_str I-15
repository_str R-121
collection Repositorio Hipermedial de la Universidad Nacional de Rosario (UNR)
language Inglés
orig_language_str_mv eng
topic Ammonoidea
Argentina
Tithonian
Picunleufuense Zone
Praestriaptychus
Late diagenetic concretions
spellingShingle Ammonoidea
Argentina
Tithonian
Picunleufuense Zone
Praestriaptychus
Late diagenetic concretions
Parent, Horacio
Garrido, Alberto C.
Schweigert, Günter
Scherzinger, Armin
Andean Lower Tithonian (Picunleufuense Zone) ammonites and aptychus from Estancia Maria Juana, Southern Neuquén Basin, Argentina
topic_facet Ammonoidea
Argentina
Tithonian
Picunleufuense Zone
Praestriaptychus
Late diagenetic concretions
description The 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.
format article
artículo
publishedVersion
author Parent, Horacio
Garrido, Alberto C.
Schweigert, Günter
Scherzinger, Armin
author_facet Parent, Horacio
Garrido, Alberto C.
Schweigert, Günter
Scherzinger, Armin
author_sort Parent, Horacio
title Andean Lower Tithonian (Picunleufuense Zone) ammonites and aptychus from Estancia Maria Juana, Southern Neuquén Basin, Argentina
title_short Andean Lower Tithonian (Picunleufuense Zone) ammonites and aptychus from Estancia Maria Juana, Southern Neuquén Basin, Argentina
title_full Andean Lower Tithonian (Picunleufuense Zone) ammonites and aptychus from Estancia Maria Juana, Southern Neuquén Basin, Argentina
title_fullStr Andean Lower Tithonian (Picunleufuense Zone) ammonites and aptychus from Estancia Maria Juana, Southern Neuquén Basin, Argentina
title_full_unstemmed Andean Lower Tithonian (Picunleufuense Zone) ammonites and aptychus from Estancia Maria Juana, Southern Neuquén Basin, Argentina
title_sort andean lower tithonian (picunleufuense zone) ammonites and aptychus from estancia maria juana, southern neuquén basin, argentina
publisher Instituto de Fisiografía y Geología. Facultad de Ciencias Exactas, Ingeniería y Agrimensura. Universidad Nacional de Rosario
publishDate 2015
url http://hdl.handle.net/2133/4864
http://hdl.handle.net/2133/4864
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