An exceptional storm accumulation of nautilids in the Lower Cretaceous of the Neuquén Basin, Argentina

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An exceptional accumulation of nautilid shells of the species Cymatoceras perstriatum (Steuer) is reported and described in the Lower Cretaceous Agrio Formation of the Neuquén Basin (west-central Argentina). The bed represents a storm deposit in a shallow-water environment within the mid-ramp. The e...

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Autores principales: Cichowolski, Marcela, Pazos, Pablo Jose, Tunik, Maísa Andrea, Aguirre-Urreta, Maria Beatriz
Publicado: 2012
Materias:
cephalopod
Cretaceous
drift behavior
geoaccumulation
infill
paleoenvironment
petrography
salinity
shallow water
shell
storm deposit
taphonomy
wind direction
Argentina
Neuquen Basin
Animalia
Cymatoceras perstriatum
Nautilida
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00241164_v45_n1_p121_Cichowolski
http://hdl.handle.net/20.500.12110/paper_00241164_v45_n1_p121_Cichowolski
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00241164_v45_n1_p121_Cichowolski
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spelling paper:paper_00241164_v45_n1_p121_Cichowolski2023-06-08T14:51:55Z An exceptional storm accumulation of nautilids in the Lower Cretaceous of the Neuquén Basin, Argentina Cichowolski, Marcela Pazos, Pablo Jose Tunik, Maísa Andrea Aguirre-Urreta, Maria Beatriz cephalopod Cretaceous drift behavior geoaccumulation infill paleoenvironment petrography salinity shallow water shell storm deposit taphonomy wind direction Argentina Neuquen Basin Animalia Cymatoceras perstriatum Nautilida An exceptional accumulation of nautilid shells of the species Cymatoceras perstriatum (Steuer) is reported and described in the Lower Cretaceous Agrio Formation of the Neuquén Basin (west-central Argentina). The bed represents a storm deposit in a shallow-water environment within the mid-ramp. The evidences of a storm-related origin of the bed come from the petrographic analysis and taphonomic features of the shells, specially the sedimentary infill pattern. The shells are dispersed in patches within the stratum, without any orientation relative to the bedding plane. It is proposed that the shells were floating after the death of the animals, although most of them have an almost complete living chamber. The presence of some heavily encrusted shells suggests that there is a mixing of specimens with different drift times. A variety of factors related to the origin of such high number of nautilid shells are discussed, including a transgressive stand system tract, the possible existence of a gregarious behaviour, changes in salinity and wind directions. □Lower Cretaceous, Nautilids, Neuquén Basin, shell accumulation, storm deposit. © 2011 The Authors, Lethaia © 2011 The Lethaia Foundation. Fil:Cichowolski, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pazos, P.J. 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. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00241164_v45_n1_p121_Cichowolski http://hdl.handle.net/20.500.12110/paper_00241164_v45_n1_p121_Cichowolski
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic cephalopod
Cretaceous
drift behavior
geoaccumulation
infill
paleoenvironment
petrography
salinity
shallow water
shell
storm deposit
taphonomy
wind direction
Argentina
Neuquen Basin
Animalia
Cymatoceras perstriatum
Nautilida
spellingShingle cephalopod
Cretaceous
drift behavior
geoaccumulation
infill
paleoenvironment
petrography
salinity
shallow water
shell
storm deposit
taphonomy
wind direction
Argentina
Neuquen Basin
Animalia
Cymatoceras perstriatum
Nautilida
Cichowolski, Marcela
Pazos, Pablo Jose
Tunik, Maísa Andrea
Aguirre-Urreta, Maria Beatriz
An exceptional storm accumulation of nautilids in the Lower Cretaceous of the Neuquén Basin, Argentina
topic_facet cephalopod
Cretaceous
drift behavior
geoaccumulation
infill
paleoenvironment
petrography
salinity
shallow water
shell
storm deposit
taphonomy
wind direction
Argentina
Neuquen Basin
Animalia
Cymatoceras perstriatum
Nautilida
description An exceptional accumulation of nautilid shells of the species Cymatoceras perstriatum (Steuer) is reported and described in the Lower Cretaceous Agrio Formation of the Neuquén Basin (west-central Argentina). The bed represents a storm deposit in a shallow-water environment within the mid-ramp. The evidences of a storm-related origin of the bed come from the petrographic analysis and taphonomic features of the shells, specially the sedimentary infill pattern. The shells are dispersed in patches within the stratum, without any orientation relative to the bedding plane. It is proposed that the shells were floating after the death of the animals, although most of them have an almost complete living chamber. The presence of some heavily encrusted shells suggests that there is a mixing of specimens with different drift times. A variety of factors related to the origin of such high number of nautilid shells are discussed, including a transgressive stand system tract, the possible existence of a gregarious behaviour, changes in salinity and wind directions. □Lower Cretaceous, Nautilids, Neuquén Basin, shell accumulation, storm deposit. © 2011 The Authors, Lethaia © 2011 The Lethaia Foundation.
author Cichowolski, Marcela
Pazos, Pablo Jose
Tunik, Maísa Andrea
Aguirre-Urreta, Maria Beatriz
author_facet Cichowolski, Marcela
Pazos, Pablo Jose
Tunik, Maísa Andrea
Aguirre-Urreta, Maria Beatriz
author_sort Cichowolski, Marcela
title An exceptional storm accumulation of nautilids in the Lower Cretaceous of the Neuquén Basin, Argentina
title_short An exceptional storm accumulation of nautilids in the Lower Cretaceous of the Neuquén Basin, Argentina
title_full An exceptional storm accumulation of nautilids in the Lower Cretaceous of the Neuquén Basin, Argentina
title_fullStr An exceptional storm accumulation of nautilids in the Lower Cretaceous of the Neuquén Basin, Argentina
title_full_unstemmed An exceptional storm accumulation of nautilids in the Lower Cretaceous of the Neuquén Basin, Argentina
title_sort exceptional storm accumulation of nautilids in the lower cretaceous of the neuquén basin, argentina
publishDate 2012
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00241164_v45_n1_p121_Cichowolski
http://hdl.handle.net/20.500.12110/paper_00241164_v45_n1_p121_Cichowolski
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