Calcispheres from the vaca muerta formation (Tithonian) in the Arroyo Covunco section, Neuquén Province

A parataxonomic, taphonomic, and biostratigraphic study of the calcispheres from the Vaca Muerta Formation (Tithonian) was carried out at the Arroyo Covunco section (Zapala, Neuquén province). We considered 215 specimens from 20 fertile samples collected every 3-10 m along 150 m of outcrop. The iden...

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Autores principales: Ruffo Rey, L.J., Kietzmann, D.A., Bressan, G.S.
Formato: JOUR
Materias:
Biostratigraphy
Calcareous dinoflagellates
Taphonomy
Upper jurassic
Dinophyceae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v75_n2_p229_RuffoRey
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00044822_v75_n2_p229_RuffoRey2023-10-03T13:59:24Z Calcispheres from the vaca muerta formation (Tithonian) in the Arroyo Covunco section, Neuquén Province Ruffo Rey, L.J. Kietzmann, D.A. Bressan, G.S. Biostratigraphy Calcareous dinoflagellates Taphonomy Upper jurassic Dinophyceae A parataxonomic, taphonomic, and biostratigraphic study of the calcispheres from the Vaca Muerta Formation (Tithonian) was carried out at the Arroyo Covunco section (Zapala, Neuquén province). We considered 215 specimens from 20 fertile samples collected every 3-10 m along 150 m of outcrop. The identified association includes 5 genera and 8 species (with 2 subspecies) already known for the Tethyan realm and the Neuquén Basin. In order to assess the existence of taphonomic biases, the effects of dissolution and neomorphism on the calcispheres walls were analysed. Vertical variations were observed in preservation, which were related primary to lithofacial differences. This allowed defining, for the first time, 5 categories of taphonomic modification to characterize the associations. Four bioevents of global importance were identified (FOs of C. pulla, P. malmica, C. tenuis and C. fortis), allowing to recognize the typical Tithonian Committosphaera tithonica?, Parastomiosphaera malmica, Colomisphaera tenuis and Colomisphaera fortis calcisphere biozones. The results of this study have allowed to adjust the position of the events with respect to previous works in the Neuquén Basin. © 2018, Asociacion Geologica Argentina. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v75_n2_p229_RuffoRey
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Biostratigraphy
Calcareous dinoflagellates
Taphonomy
Upper jurassic
Dinophyceae
spellingShingle Biostratigraphy
Calcareous dinoflagellates
Taphonomy
Upper jurassic
Dinophyceae
Ruffo Rey, L.J.
Kietzmann, D.A.
Bressan, G.S.
Calcispheres from the vaca muerta formation (Tithonian) in the Arroyo Covunco section, Neuquén Province
topic_facet Biostratigraphy
Calcareous dinoflagellates
Taphonomy
Upper jurassic
Dinophyceae
description A parataxonomic, taphonomic, and biostratigraphic study of the calcispheres from the Vaca Muerta Formation (Tithonian) was carried out at the Arroyo Covunco section (Zapala, Neuquén province). We considered 215 specimens from 20 fertile samples collected every 3-10 m along 150 m of outcrop. The identified association includes 5 genera and 8 species (with 2 subspecies) already known for the Tethyan realm and the Neuquén Basin. In order to assess the existence of taphonomic biases, the effects of dissolution and neomorphism on the calcispheres walls were analysed. Vertical variations were observed in preservation, which were related primary to lithofacial differences. This allowed defining, for the first time, 5 categories of taphonomic modification to characterize the associations. Four bioevents of global importance were identified (FOs of C. pulla, P. malmica, C. tenuis and C. fortis), allowing to recognize the typical Tithonian Committosphaera tithonica?, Parastomiosphaera malmica, Colomisphaera tenuis and Colomisphaera fortis calcisphere biozones. The results of this study have allowed to adjust the position of the events with respect to previous works in the Neuquén Basin. © 2018, Asociacion Geologica Argentina. All rights reserved.
format JOUR
author Ruffo Rey, L.J.
Kietzmann, D.A.
Bressan, G.S.
author_facet Ruffo Rey, L.J.
Kietzmann, D.A.
Bressan, G.S.
author_sort Ruffo Rey, L.J.
title Calcispheres from the vaca muerta formation (Tithonian) in the Arroyo Covunco section, Neuquén Province
title_short Calcispheres from the vaca muerta formation (Tithonian) in the Arroyo Covunco section, Neuquén Province
title_full Calcispheres from the vaca muerta formation (Tithonian) in the Arroyo Covunco section, Neuquén Province
title_fullStr Calcispheres from the vaca muerta formation (Tithonian) in the Arroyo Covunco section, Neuquén Province
title_full_unstemmed Calcispheres from the vaca muerta formation (Tithonian) in the Arroyo Covunco section, Neuquén Province
title_sort calcispheres from the vaca muerta formation (tithonian) in the arroyo covunco section, neuquén province
url http://hdl.handle.net/20.500.12110/paper_00044822_v75_n2_p229_RuffoRey
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AT bressangs calcispheresfromthevacamuertaformationtithonianinthearroyocovuncosectionneuquenprovince
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