The ammonite sequence in the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina

The Agrio Formation of the Neuquén Basin, Argentina, contains an extensive sequence of ammonite faunas, most of which are monogeneric. Detailed collecting through 15 sections across the basin has facilitated a major revision of the ammonite zonation. Formerly embracing four broad zones, the Agrio Fo...

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Detalles Bibliográficos
Autores principales:	Aguirre Urreta, M.B., Rawson, P.F.
Formato:	JOUR
Materias:	ammonite biostratigraphy Cretaceous Argentina, Neuquen Basin
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00167568_v134_n4_p449_AguirreUrreta
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00167568_v134_n4_p449_AguirreUrreta
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spelling	todo:paper_00167568_v134_n4_p449_AguirreUrreta2023-10-03T14:14:41Z The ammonite sequence in the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina Aguirre Urreta, M.B. Rawson, P.F. ammonite biostratigraphy Cretaceous Argentina, Neuquen Basin The Agrio Formation of the Neuquén Basin, Argentina, contains an extensive sequence of ammonite faunas, most of which are monogeneric. Detailed collecting through 15 sections across the basin has facilitated a major revision of the ammonite zonation. Formerly embracing four broad zones, the Agrio Formation is now divided into nine zones, the lowest four of which are divided into a total of 11 subzones. The new zonation provides a standard against which other South American faunas can be compared. The degree of subdivision now achieved is comparable to that for the 'standard' sequences of the West Mediterranean region. Although it is not possible to correlate the two regions in detail, the occurrence of some widely distributed genera (Olcostephanus, Karakaschiceras, Oosterella, Spitidiscus and Crioceratites) at well-defined levels in the Neuquén Basin provides some crucial links. Thus the approximate positions of the Lower/Upper Valanginian, Valanginian/Hauterivian and Lower/Upper Hauterivian boundaries can be determined. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00167568_v134_n4_p449_AguirreUrreta
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	ammonite biostratigraphy Cretaceous Argentina, Neuquen Basin
spellingShingle	ammonite biostratigraphy Cretaceous Argentina, Neuquen Basin Aguirre Urreta, M.B. Rawson, P.F. The ammonite sequence in the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina
topic_facet	ammonite biostratigraphy Cretaceous Argentina, Neuquen Basin
description	The Agrio Formation of the Neuquén Basin, Argentina, contains an extensive sequence of ammonite faunas, most of which are monogeneric. Detailed collecting through 15 sections across the basin has facilitated a major revision of the ammonite zonation. Formerly embracing four broad zones, the Agrio Formation is now divided into nine zones, the lowest four of which are divided into a total of 11 subzones. The new zonation provides a standard against which other South American faunas can be compared. The degree of subdivision now achieved is comparable to that for the 'standard' sequences of the West Mediterranean region. Although it is not possible to correlate the two regions in detail, the occurrence of some widely distributed genera (Olcostephanus, Karakaschiceras, Oosterella, Spitidiscus and Crioceratites) at well-defined levels in the Neuquén Basin provides some crucial links. Thus the approximate positions of the Lower/Upper Valanginian, Valanginian/Hauterivian and Lower/Upper Hauterivian boundaries can be determined.
format	JOUR
author	Aguirre Urreta, M.B. Rawson, P.F.
author_facet	Aguirre Urreta, M.B. Rawson, P.F.
author_sort	Aguirre Urreta, M.B.
title	The ammonite sequence in the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina
title_short	The ammonite sequence in the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina
title_full	The ammonite sequence in the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina
title_fullStr	The ammonite sequence in the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina
title_full_unstemmed	The ammonite sequence in the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina
title_sort	ammonite sequence in the agrio formation (lower cretaceous), neuquén basin, argentina
url	http://hdl.handle.net/20.500.12110/paper_00167568_v134_n4_p449_AguirreUrreta
work_keys_str_mv	AT aguirreurretamb theammonitesequenceintheagrioformationlowercretaceousneuquenbasinargentina AT rawsonpf theammonitesequenceintheagrioformationlowercretaceousneuquenbasinargentina AT aguirreurretamb ammonitesequenceintheagrioformationlowercretaceousneuquenbasinargentina AT rawsonpf ammonitesequenceintheagrioformationlowercretaceousneuquenbasinargentina
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The ammonite sequence in the Agrio Formation (Lower Cretaceous), Neuquén Basin, Argentina

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