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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2006
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07160208_v33_n1_p47_Ballent http://hdl.handle.net/20.500.12110/paper_07160208_v33_n1_p47_Ballent |
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paper:paper_07160208_v33_n1_p47_Ballent2023-06-08T15:42:52Z Biostratigraphy and palaeoenvironment of the Agrio Formation (Lower Cretaceous), Mendoza Province, Neuquén Basin, Argentina 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. 2006 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07160208_v33_n1_p47_Ballent 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 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. |
| 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 |
| publishDate |
2006 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07160208_v33_n1_p47_Ballent http://hdl.handle.net/20.500.12110/paper_07160208_v33_n1_p47_Ballent |
| _version_ |
1768541992656044032 |