Taphonomy and palaeoecology of Hauterivian-Barremian nerineoid shell beds from the Neuquén Basin, west-central Argentina

Nerineoid shell beds are described for the first time from Lower Cretaceous deposits of southern South America. These come from carbonates near the top of the Agrio Formation in southern Mendoza Province, west-central Argentina. To envisage the origin of the nerineoid shell beds, a taphonomic study...

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Autores principales: Cataldo, Cecilia Soledad, Lazo, Dario Gustavo, Tunik, Maísa Andrea, Aguirre-Urreta, Maria Beatriz
Publicado: 2013
Materias:
Barremian
carbonate ramp
carbonate system
facies analysis
functional morphology
Hauterivian
paleoecology
paleoenvironment
shell bed
substrate
taphonomy
Argentina
Neuquen Basin
Gastropoda
Nerineoidea
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00241164_v46_n1_p114_Cataldo
http://hdl.handle.net/20.500.12110/paper_00241164_v46_n1_p114_Cataldo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_00241164_v46_n1_p114_Cataldo2023-06-08T14:51:55Z Taphonomy and palaeoecology of Hauterivian-Barremian nerineoid shell beds from the Neuquén Basin, west-central Argentina Cataldo, Cecilia Soledad Lazo, Dario Gustavo Tunik, Maísa Andrea Aguirre-Urreta, Maria Beatriz Barremian carbonate ramp carbonate system facies analysis functional morphology Hauterivian paleoecology paleoenvironment shell bed substrate taphonomy Argentina Neuquen Basin Gastropoda Nerineoidea Nerineoid shell beds are described for the first time from Lower Cretaceous deposits of southern South America. These come from carbonates near the top of the Agrio Formation in southern Mendoza Province, west-central Argentina. To envisage the origin of the nerineoid shell beds, a taphonomic study was carried out, which indicated that these represent within-habitat time-averaged, primary sedimentological concentrations with a secondary biogenic imprint related to a relatively high local production of nerineoid shells. The associated palaeoenvironments were studied through a facies analysis of the carbonate succession including the shell beds. The carbonates were deposited in a homoclinal ramp system and depict a shallowing upward trend from mid to inner ramp. The individuals lived and accumulated in oolitic shoals within the inner ramp, in a shallow, well-lit, high-energy setting above fair-weather wave base. Substrate was oxygenated and loose. The nerineoids are shown to belong to one species of the genus Eunerinea, and through the functional morphology of the shells they are tentatively interpreted as infaunal or semi-infaunal. It is suggested that the recorded monospecific nerineoid shell beds indicate that the palaeoenvironmental conditions may have been favourable for the development of abundant populations of these gastropods in the northern part of the Neuquén Basin during a short time interval in the Hauterivian-Barremian boundary. This could have been related to a brief warming episode, but other factors may have also been involved. □Argentina, Early Cretaceous, Gastropods, nerineoids, Neuquén Basin, shell beds, taphonomy. © 2012 The Authors, Lethaia © 2012 The Lethaia Foundation. Fil:Cataldo, C.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lazo, D.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tunik, M.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Aguirre-Urreta, M.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00241164_v46_n1_p114_Cataldo http://hdl.handle.net/20.500.12110/paper_00241164_v46_n1_p114_Cataldo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Barremian
carbonate ramp
carbonate system
facies analysis
functional morphology
Hauterivian
paleoecology
paleoenvironment
shell bed
substrate
taphonomy
Argentina
Neuquen Basin
Gastropoda
Nerineoidea
spellingShingle Barremian
carbonate ramp
carbonate system
facies analysis
functional morphology
Hauterivian
paleoecology
paleoenvironment
shell bed
substrate
taphonomy
Argentina
Neuquen Basin
Gastropoda
Nerineoidea
Cataldo, Cecilia Soledad
Lazo, Dario Gustavo
Tunik, Maísa Andrea
Aguirre-Urreta, Maria Beatriz
Taphonomy and palaeoecology of Hauterivian-Barremian nerineoid shell beds from the Neuquén Basin, west-central Argentina
topic_facet Barremian
carbonate ramp
carbonate system
facies analysis
functional morphology
Hauterivian
paleoecology
paleoenvironment
shell bed
substrate
taphonomy
Argentina
Neuquen Basin
Gastropoda
Nerineoidea
description Nerineoid shell beds are described for the first time from Lower Cretaceous deposits of southern South America. These come from carbonates near the top of the Agrio Formation in southern Mendoza Province, west-central Argentina. To envisage the origin of the nerineoid shell beds, a taphonomic study was carried out, which indicated that these represent within-habitat time-averaged, primary sedimentological concentrations with a secondary biogenic imprint related to a relatively high local production of nerineoid shells. The associated palaeoenvironments were studied through a facies analysis of the carbonate succession including the shell beds. The carbonates were deposited in a homoclinal ramp system and depict a shallowing upward trend from mid to inner ramp. The individuals lived and accumulated in oolitic shoals within the inner ramp, in a shallow, well-lit, high-energy setting above fair-weather wave base. Substrate was oxygenated and loose. The nerineoids are shown to belong to one species of the genus Eunerinea, and through the functional morphology of the shells they are tentatively interpreted as infaunal or semi-infaunal. It is suggested that the recorded monospecific nerineoid shell beds indicate that the palaeoenvironmental conditions may have been favourable for the development of abundant populations of these gastropods in the northern part of the Neuquén Basin during a short time interval in the Hauterivian-Barremian boundary. This could have been related to a brief warming episode, but other factors may have also been involved. □Argentina, Early Cretaceous, Gastropods, nerineoids, Neuquén Basin, shell beds, taphonomy. © 2012 The Authors, Lethaia © 2012 The Lethaia Foundation.
author Cataldo, Cecilia Soledad
Lazo, Dario Gustavo
Tunik, Maísa Andrea
Aguirre-Urreta, Maria Beatriz
author_facet Cataldo, Cecilia Soledad
Lazo, Dario Gustavo
Tunik, Maísa Andrea
Aguirre-Urreta, Maria Beatriz
author_sort Cataldo, Cecilia Soledad
title Taphonomy and palaeoecology of Hauterivian-Barremian nerineoid shell beds from the Neuquén Basin, west-central Argentina
title_short Taphonomy and palaeoecology of Hauterivian-Barremian nerineoid shell beds from the Neuquén Basin, west-central Argentina
title_full Taphonomy and palaeoecology of Hauterivian-Barremian nerineoid shell beds from the Neuquén Basin, west-central Argentina
title_fullStr Taphonomy and palaeoecology of Hauterivian-Barremian nerineoid shell beds from the Neuquén Basin, west-central Argentina
title_full_unstemmed Taphonomy and palaeoecology of Hauterivian-Barremian nerineoid shell beds from the Neuquén Basin, west-central Argentina
title_sort taphonomy and palaeoecology of hauterivian-barremian nerineoid shell beds from the neuquén basin, west-central argentina
publishDate 2013
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00241164_v46_n1_p114_Cataldo
http://hdl.handle.net/20.500.12110/paper_00241164_v46_n1_p114_Cataldo
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