Integrated biostratigraphy of the Agrio Formation in its type locality, Early Cretaceous of the Neuquén Basin

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The Lower Cretaceous of the Neuquén Basin represents one of the most complete series in the Andes of South America. Highly fossiliferous exposures make correlation easy among different localities and allow to perform detailed studies of the fossil content. This paper presents, for the first time, an...

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Autores principales: Lazo, D.G., Concheyro, G.A., Ottone, E.G., Guler, M.V., Aguirre-Urreta, B.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2009
Materias:
Ammonoids
Biostratigraphy
Bivalves
Hauterivian
Nannofossils
Palynomorphs
Valanginian
ammonite
biostratigraphy
bivalve
nanofossil
palynomorph
taxonomy
zonation
Argentina
Neuquen Basin
Ammonoidea
Bivalvia
Steinmanella
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v65_n2_p322_Lazo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paperaa:paper_00044822_v65_n2_p322_Lazo
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spelling paperaa:paper_00044822_v65_n2_p322_Lazo2023-06-12T16:40:23Z Integrated biostratigraphy of the Agrio Formation in its type locality, Early Cretaceous of the Neuquén Basin Rev. Asoc. Geol. Argent. 2009;65(2):322-341 Lazo, D.G. Concheyro, G.A. Ottone, E.G. Guler, M.V. Aguirre-Urreta, B. Ammonoids Biostratigraphy Bivalves Hauterivian Nannofossils Palynomorphs Valanginian ammonite biostratigraphy bivalve Hauterivian nanofossil palynomorph taxonomy Valanginian zonation Argentina Neuquen Basin Ammonoidea Bivalvia Steinmanella The Lower Cretaceous of the Neuquén Basin represents one of the most complete series in the Andes of South America. Highly fossiliferous exposures make correlation easy among different localities and allow to perform detailed studies of the fossil content. This paper presents, for the first time, an integrated biostratigraphic zonation for the Agrio Formation in its type section, based on ammonoids, bivalves, nannofossils and palynomorphs. A detailed section from base to top of the Agrio Formation was measured in the Bajada del Agrio region near the junction of Salado and Agrio Rivers in Central Neuquén. Our focus centred on the two marine members. In the field 39 ammonoid levels were identified and 74 samples of black and grey shales were collected to search calcareous nannofossils and palynomorphs. In addition, 41 Steinmanella Crickmay bearing levels and four levels containing Neocomiceramus curacoensis (Weaver) were identified. Four ammonoids zones, eight ammonoids subzones and two bivalve zones were recognized in the Pilmatué Member encompassing the late Valanginian to the early Hauterivian. Four ammonoids zones and two bivalve zones were recognized in the Agua de la Mula Member encompassing the late Hauterivian and reaching the basal Barremian. Another bivalve zone was identified in the Spitidiscus riccardii Zone, but left undefined due to unsolved taxonomy. The analyzed fossil groups have mainly tethyan affinities. Correlations to the European standard zonations are possible due to the presence of some index ammonoids, but also due to some nannofossil bioevents. Palynomorphs resulted not very useful in biostratigraphy. Continental palynomorphs have affinities to Gondwana while marine palynomorphs have clear tethyan affinities. Bivalves have proved locally useful in biostratigraphy, but index species are endemic to the basin and thus difficult to correlate to other regions or continents. Fil:Lazo, D.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Concheyro, G.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ottone, E.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Aguirre-Urreta, B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2009 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v65_n2_p322_Lazo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
topic Ammonoids
Biostratigraphy
Bivalves
Hauterivian
Nannofossils
Palynomorphs
Valanginian
ammonite
biostratigraphy
bivalve
Hauterivian
nanofossil
palynomorph
taxonomy
Valanginian
zonation
Argentina
Neuquen Basin
Ammonoidea
Bivalvia
Steinmanella
spellingShingle Ammonoids
Biostratigraphy
Bivalves
Hauterivian
Nannofossils
Palynomorphs
Valanginian
ammonite
biostratigraphy
bivalve
Hauterivian
nanofossil
palynomorph
taxonomy
Valanginian
zonation
Argentina
Neuquen Basin
Ammonoidea
Bivalvia
Steinmanella
Lazo, D.G.
Concheyro, G.A.
Ottone, E.G.
Guler, M.V.
Aguirre-Urreta, B.
Integrated biostratigraphy of the Agrio Formation in its type locality, Early Cretaceous of the Neuquén Basin
topic_facet Ammonoids
Biostratigraphy
Bivalves
Hauterivian
Nannofossils
Palynomorphs
Valanginian
ammonite
biostratigraphy
bivalve
Hauterivian
nanofossil
palynomorph
taxonomy
Valanginian
zonation
Argentina
Neuquen Basin
Ammonoidea
Bivalvia
Steinmanella
description The Lower Cretaceous of the Neuquén Basin represents one of the most complete series in the Andes of South America. Highly fossiliferous exposures make correlation easy among different localities and allow to perform detailed studies of the fossil content. This paper presents, for the first time, an integrated biostratigraphic zonation for the Agrio Formation in its type section, based on ammonoids, bivalves, nannofossils and palynomorphs. A detailed section from base to top of the Agrio Formation was measured in the Bajada del Agrio region near the junction of Salado and Agrio Rivers in Central Neuquén. Our focus centred on the two marine members. In the field 39 ammonoid levels were identified and 74 samples of black and grey shales were collected to search calcareous nannofossils and palynomorphs. In addition, 41 Steinmanella Crickmay bearing levels and four levels containing Neocomiceramus curacoensis (Weaver) were identified. Four ammonoids zones, eight ammonoids subzones and two bivalve zones were recognized in the Pilmatué Member encompassing the late Valanginian to the early Hauterivian. Four ammonoids zones and two bivalve zones were recognized in the Agua de la Mula Member encompassing the late Hauterivian and reaching the basal Barremian. Another bivalve zone was identified in the Spitidiscus riccardii Zone, but left undefined due to unsolved taxonomy. The analyzed fossil groups have mainly tethyan affinities. Correlations to the European standard zonations are possible due to the presence of some index ammonoids, but also due to some nannofossil bioevents. Palynomorphs resulted not very useful in biostratigraphy. Continental palynomorphs have affinities to Gondwana while marine palynomorphs have clear tethyan affinities. Bivalves have proved locally useful in biostratigraphy, but index species are endemic to the basin and thus difficult to correlate to other regions or continents.
format Artículo
Artículo
publishedVersion
author Lazo, D.G.
Concheyro, G.A.
Ottone, E.G.
Guler, M.V.
Aguirre-Urreta, B.
author_facet Lazo, D.G.
Concheyro, G.A.
Ottone, E.G.
Guler, M.V.
Aguirre-Urreta, B.
author_sort Lazo, D.G.
title Integrated biostratigraphy of the Agrio Formation in its type locality, Early Cretaceous of the Neuquén Basin
title_short Integrated biostratigraphy of the Agrio Formation in its type locality, Early Cretaceous of the Neuquén Basin
title_full Integrated biostratigraphy of the Agrio Formation in its type locality, Early Cretaceous of the Neuquén Basin
title_fullStr Integrated biostratigraphy of the Agrio Formation in its type locality, Early Cretaceous of the Neuquén Basin
title_full_unstemmed Integrated biostratigraphy of the Agrio Formation in its type locality, Early Cretaceous of the Neuquén Basin
title_sort integrated biostratigraphy of the agrio formation in its type locality, early cretaceous of the neuquén basin
publishDate 2009
url http://hdl.handle.net/20.500.12110/paper_00044822_v65_n2_p322_Lazo
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