Biostratigraphy and palaeoenvironment of the Agrio Formation (Lower Cretaceous), Mendoza Province, Neuquén Basin, Argentina

A bioestratigraphical and palaeoenvironmental study of the Agrio Formation, at the Cuesta del Chihuido section, southern Mendoza Province (35°45′S/69°34′W), Argentina, is presented. Thirty seven species of nannofossils, thirty four of foraminifers and six of ostracods have been recognized. Nannofoss...

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Autores principales:	Ballent, S., Concheyro, A., Sagasti, G.
Formato:	JOUR
Materias:	Agrio Formation Argentina Biostratigraphy Calcareous microfossils Lower Cretaceous Palaeoenvironment Biodiversity Eutrophication Geology Geomorphology Marine biology Sandstone Silt benthic foraminifera biostratigraphy Cretaceous microfossil nanofossil paleoenvironment Mendoza South America Epistomina Foraminifera Lagenidae Ostracoda Polymorphinidae Spirillinidae
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_07160208_v33_n1_p47_Ballent
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_07160208_v33_n1_p47_Ballent
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spelling	todo:paper_07160208_v33_n1_p47_Ballent2023-10-03T15:36:12Z Biostratigraphy and palaeoenvironment of the Agrio Formation (Lower Cretaceous), Mendoza Province, Neuquén Basin, Argentina Ballent, S. Concheyro, A. Sagasti, G. Agrio Formation Argentina Biostratigraphy Calcareous microfossils Lower Cretaceous Palaeoenvironment Biodiversity Eutrophication Geology Geomorphology Marine biology Sandstone Silt benthic foraminifera biostratigraphy Cretaceous microfossil nanofossil paleoenvironment Argentina Mendoza South America Epistomina Foraminifera Lagenidae Ostracoda Polymorphinidae Spirillinidae A bioestratigraphical and palaeoenvironmental study of the Agrio Formation, at the Cuesta del Chihuido section, southern Mendoza Province (35°45′S/69°34′W), Argentina, is presented. Thirty seven species of nannofossils, thirty four of foraminifers and six of ostracods have been recognized. Nannofossils association corresponding to Zones CC4A y CC4B indicates an Upper Valanginian-Upper Hauterivian age. At the base of the section, the presence of the benthonic foraminifer Epistomina loncochensis Ballent and radiolaria suggests eutrophic conditions of surface waters and oxygen depressed sea-bottom conditions. In the middle part of the section, diversity of lagenid foraminifers and nannofossils indicates a shelf and nearshore environment with clear and well-oxygenated waters. Abundant polymorphinids, spirillinids and involitinids towards the top of the section corroborate a general regressive tendency. Mudstones and silty-sandstone intercalations containing allochthonous adherent foraminifers and adult carapaces of cytheroid ostracods represent distal storm deposits. © 2006 Servicio Nacional de Geologí y Minería. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_07160208_v33_n1_p47_Ballent
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Agrio Formation Argentina Biostratigraphy Calcareous microfossils Lower Cretaceous Palaeoenvironment Biodiversity Eutrophication Geology Geomorphology Marine biology Sandstone Silt benthic foraminifera biostratigraphy Cretaceous microfossil nanofossil paleoenvironment Argentina Mendoza South America Epistomina Foraminifera Lagenidae Ostracoda Polymorphinidae Spirillinidae
spellingShingle	Agrio Formation Argentina Biostratigraphy Calcareous microfossils Lower Cretaceous Palaeoenvironment Biodiversity Eutrophication Geology Geomorphology Marine biology Sandstone Silt benthic foraminifera biostratigraphy Cretaceous microfossil nanofossil paleoenvironment Argentina Mendoza South America Epistomina Foraminifera Lagenidae Ostracoda Polymorphinidae Spirillinidae Ballent, S. Concheyro, A. Sagasti, G. Biostratigraphy and palaeoenvironment of the Agrio Formation (Lower Cretaceous), Mendoza Province, Neuquén Basin, Argentina
topic_facet	Agrio Formation Argentina Biostratigraphy Calcareous microfossils Lower Cretaceous Palaeoenvironment Biodiversity Eutrophication Geology Geomorphology Marine biology Sandstone Silt benthic foraminifera biostratigraphy Cretaceous microfossil nanofossil paleoenvironment Argentina Mendoza South America Epistomina Foraminifera Lagenidae Ostracoda Polymorphinidae Spirillinidae
description	A bioestratigraphical and palaeoenvironmental study of the Agrio Formation, at the Cuesta del Chihuido section, southern Mendoza Province (35°45′S/69°34′W), Argentina, is presented. Thirty seven species of nannofossils, thirty four of foraminifers and six of ostracods have been recognized. Nannofossils association corresponding to Zones CC4A y CC4B indicates an Upper Valanginian-Upper Hauterivian age. At the base of the section, the presence of the benthonic foraminifer Epistomina loncochensis Ballent and radiolaria suggests eutrophic conditions of surface waters and oxygen depressed sea-bottom conditions. In the middle part of the section, diversity of lagenid foraminifers and nannofossils indicates a shelf and nearshore environment with clear and well-oxygenated waters. Abundant polymorphinids, spirillinids and involitinids towards the top of the section corroborate a general regressive tendency. Mudstones and silty-sandstone intercalations containing allochthonous adherent foraminifers and adult carapaces of cytheroid ostracods represent distal storm deposits. © 2006 Servicio Nacional de Geologí y Minería.
format	JOUR
author	Ballent, S. Concheyro, A. Sagasti, G.
author_facet	Ballent, S. Concheyro, A. Sagasti, G.
author_sort	Ballent, S.
title	Biostratigraphy and palaeoenvironment of the Agrio Formation (Lower Cretaceous), Mendoza Province, Neuquén Basin, Argentina
title_short	Biostratigraphy and palaeoenvironment of the Agrio Formation (Lower Cretaceous), Mendoza Province, Neuquén Basin, Argentina
title_full	Biostratigraphy and palaeoenvironment of the Agrio Formation (Lower Cretaceous), Mendoza Province, Neuquén Basin, Argentina
title_fullStr	Biostratigraphy and palaeoenvironment of the Agrio Formation (Lower Cretaceous), Mendoza Province, Neuquén Basin, Argentina
title_full_unstemmed	Biostratigraphy and palaeoenvironment of the Agrio Formation (Lower Cretaceous), Mendoza Province, Neuquén Basin, Argentina
title_sort	biostratigraphy and palaeoenvironment of the agrio formation (lower cretaceous), mendoza province, neuquén basin, argentina
url	http://hdl.handle.net/20.500.12110/paper_07160208_v33_n1_p47_Ballent
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Biostratigraphy and palaeoenvironment of the Agrio Formation (Lower Cretaceous), Mendoza Province, Neuquén Basin, Argentina

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