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Abstract:

The nanoflora and microfauna from the Agrio Formation are analyzed in three different areas of the Neuquén Basin to establish its age and paleonvironmental variations. In the northern area of the basin, the oldest Agrio Fomation sedimentites are recognized and assigned to the Lower Valanginian through ammonites. A monospecific Epistomina loncochensis Ballent microfauna is recovered from these levels, which indicates disoxic environments. Up to the top of the section, siltstones contain a diverse foraminifera microfauna of normal shelves, which are replaced by an impoverished fauna related to shallowing processes. The age defined by calcareous nannofossils is Late Valanginian-Late Hauterivian. In the central and southern position of the Neuquén Basin, the nannofossil assemblages indicate the Upper Valanginian-Upper Hauterivian for the Agrio Formation. The benthic microfauna suggests frequent eustatic variations ranging from shelves to shallow marine environments. In the austral sector of the basin, a poorly diversified foraminiferal assemblage is recorded and a high ostracods/foraminifera ratio indicates a restricted marine environment, and normal salinity. The presence of a level with abundant attached foraminifera indicates high energy episodes. The high diversified Platycopida ostracods suggest warm-temperate to subtropical waters.

Registro:

Documento: Artículo
Título:Micropaleontology of the Agrio Formation (Lower Cretaceous) in different areas of the Neuquén Basin
Autor:Concheyro, A.; Lescano, M.; Caramés, A.; Ballent, S.
Filiación:Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina
Instituto Antártico Argentino, Argentina
División Paleontología Invertebrados, Museo de La Plata, La Plata, Argentina
Palabras clave:Argentina; Biostratigraphy; Mesozoic; Microfossils; Nannofossils; Paleoecology; biostratigraphy; calcareous alga; fauna; foraminifera; fossil assemblage; Mesozoic; microfossil; micropaleontology; paleoecology; paleoenvironment; Argentina; Neuquen Basin; Epistomina; Foraminifera; Ostracoda; Platycopida
Año:2009
Volumen:65
Número:2
Página de inicio:342
Página de fin:361
Título revista:Revista de la Asociacion Geologica Argentina
Título revista abreviado:Rev. Asoc. Geol. Argent.
ISSN:00044822
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00044822_v65_n2_p342_Concheyro.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v65_n2_p342_Concheyro

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Citas:

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Concheyro, A., Lescano, M., Caramés, A. & Ballent, S. (2009) . Micropaleontology of the Agrio Formation (Lower Cretaceous) in different areas of the Neuquén Basin . Revista de la Asociacion Geologica Argentina, 65(2), 342-361.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v65_n2_p342_Concheyro [ ]
---------- CHICAGO ----------
Concheyro, A., Lescano, M., Caramés, A., Ballent, S. "Micropaleontology of the Agrio Formation (Lower Cretaceous) in different areas of the Neuquén Basin " . Revista de la Asociacion Geologica Argentina 65, no. 2 (2009) : 342-361.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v65_n2_p342_Concheyro [ ]
---------- MLA ----------
Concheyro, A., Lescano, M., Caramés, A., Ballent, S. "Micropaleontology of the Agrio Formation (Lower Cretaceous) in different areas of the Neuquén Basin " . Revista de la Asociacion Geologica Argentina, vol. 65, no. 2, 2009, pp. 342-361.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v65_n2_p342_Concheyro [ ]
---------- VANCOUVER ----------
Concheyro, A., Lescano, M., Caramés, A., Ballent, S. Micropaleontology of the Agrio Formation (Lower Cretaceous) in different areas of the Neuquén Basin . Rev. Asoc. Geol. Argent. 2009;65(2):342-361.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v65_n2_p342_Concheyro [ ]