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Abstract:

The lithofacies and macrofossil guilds of the Agrio Formation (Upper Valanginian-Lower Barremian) have been analysed using evidence from sedimentological, taphonomic and palaeoecological studies. The study area is Agua de la Mula and adjacent regions in central Neuquén. Seven lithofacies have been recognized in the field, which indicate that the Agrio Formation was deposited in an open-marine, ramp depositional system under storm influence. Lithofacies indicate conditions that range from low-energy basin to high-energy inner ramp. Outer and mid-ramp deposits are the most abundant. Macrofossils have been grouped into 16 guilds based on tiering, life habit and feeding category. The guilds indicate normal benthic oxygen level, normal salinity, and soft-firm muddy and sandy bottoms. Suspension-feeders are more common than deposit-feeders suggesting the predominance of suspended food particles over deposited food resources. A low input of siliciclastics and, possibly, other palaeoceanographic conditions allowed the development of oolitic facies in the inner ramp and coral patch reefs in the upper mid-ramp for a limited period of time. © The Geological Society of London 2005.

Registro:

Documento: Artículo
Título:Lithofacies, palaeoecology and palaeoenvironments of the Agrio Formation, Lower Cretaceous of the Neuquén Basin, Argentina
Autor:Lazo, D.G.; Cichowolski, M.; Rodríguez, D.L.; Aguirre-Urreta, M.B.
Filiación:Laboratorio de Bioestratigrafía de Alta Resolución, Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Pabellón II, 1428 Buenos Aires, Argentina
Palabras clave:basin fill; Cretaceous; facies analysis; paleoecology; paleoenvironment; Argentina; Neuquen Basin; South America; Anthozoa
Año:2005
Volumen:252
Página de inicio:295
Página de fin:315
DOI: http://dx.doi.org/10.1144/GSL.SP.2005.252.01.15
Título revista:Geological Society Special Publication
Título revista abreviado:Geol. Soc. Spec. Publ.
ISSN:03058719
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03058719_v252_n_p295_Lazo

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Citas:

---------- APA ----------
Lazo, D.G., Cichowolski, M., Rodríguez, D.L. & Aguirre-Urreta, M.B. (2005) . Lithofacies, palaeoecology and palaeoenvironments of the Agrio Formation, Lower Cretaceous of the Neuquén Basin, Argentina. Geological Society Special Publication, 252, 295-315.
http://dx.doi.org/10.1144/GSL.SP.2005.252.01.15
---------- CHICAGO ----------
Lazo, D.G., Cichowolski, M., Rodríguez, D.L., Aguirre-Urreta, M.B. "Lithofacies, palaeoecology and palaeoenvironments of the Agrio Formation, Lower Cretaceous of the Neuquén Basin, Argentina" . Geological Society Special Publication 252 (2005) : 295-315.
http://dx.doi.org/10.1144/GSL.SP.2005.252.01.15
---------- MLA ----------
Lazo, D.G., Cichowolski, M., Rodríguez, D.L., Aguirre-Urreta, M.B. "Lithofacies, palaeoecology and palaeoenvironments of the Agrio Formation, Lower Cretaceous of the Neuquén Basin, Argentina" . Geological Society Special Publication, vol. 252, 2005, pp. 295-315.
http://dx.doi.org/10.1144/GSL.SP.2005.252.01.15
---------- VANCOUVER ----------
Lazo, D.G., Cichowolski, M., Rodríguez, D.L., Aguirre-Urreta, M.B. Lithofacies, palaeoecology and palaeoenvironments of the Agrio Formation, Lower Cretaceous of the Neuquén Basin, Argentina. Geol. Soc. Spec. Publ. 2005;252:295-315.
http://dx.doi.org/10.1144/GSL.SP.2005.252.01.15