Taphonomy, time-averaging and lateral transport of the macrofossils of the Pilmatué Member of the Agrio Formation, Lower Cretaceous, Neuquén basin, Argentina

A taphonomic and sedimentary facies analysis of the Pilmatué Member of the Agrio Formation in central Neuquén basin is presented to determine the time-averaging and degree of lateral transport of its macrofauna. The Pilmatué Member is characterized by abundant fossil concentrations dominated by bent...

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Autor principal: Lazo, D.G.
Formato: JOUR
Materias:
Macrofauna
Storm influenced shoreface-shelf
Taphonomy
Valanginian-Hauterivian
benthos
fossil
Hauterivian
sediment analysis
stratigraphy
taphonomy
Valanginian
Argentina
Neuquen Basin
South America
Ammonoidea
Anthozoa
Bivalvia
Gastropoda
Serpulidae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00027014_v43_n2_p311_Lazo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00027014_v43_n2_p311_Lazo2023-10-03T13:52:58Z Taphonomy, time-averaging and lateral transport of the macrofossils of the Pilmatué Member of the Agrio Formation, Lower Cretaceous, Neuquén basin, Argentina Lazo, D.G. Macrofauna Storm influenced shoreface-shelf Taphonomy Valanginian-Hauterivian benthos fossil Hauterivian sediment analysis stratigraphy taphonomy Valanginian Argentina Neuquen Basin South America Ammonoidea Anthozoa Bivalvia Gastropoda Serpulidae A taphonomic and sedimentary facies analysis of the Pilmatué Member of the Agrio Formation in central Neuquén basin is presented to determine the time-averaging and degree of lateral transport of its macrofauna. The Pilmatué Member is characterized by abundant fossil concentrations dominated by benthic organisms such as corals, serpulids, bivalves and gastropods. Stratigraphic occurrence of benthic elements was accurately dated by a refined ammonite zonation of the Agrio Formation. Three sections were studied between Chos Malal and Zapala (Neuquén) situated on a north-south line of 44.2 km. Five litofacies and nine taphofacies were defined. The depositonal system is interpreted as a storm influenced homoclinal shoreface to shelf environment. Taphonomic analysis showed that most macrofaunistic associations are autochthonous or slightly parautochthonous with no significant lateral transport. Census, within-habitat time-averaged and environmentally condensed assemblages were identified. Time scales of fossil accumulation span from days-years up to 0.5 My. Nearshore assemblages are less time-averaged than shelf assemblages as in modern settings. © Asociación Paleontológica Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00027014_v43_n2_p311_Lazo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Macrofauna
Storm influenced shoreface-shelf
Taphonomy
Valanginian-Hauterivian
benthos
fossil
Hauterivian
sediment analysis
stratigraphy
taphonomy
Valanginian
Argentina
Neuquen Basin
South America
Ammonoidea
Anthozoa
Bivalvia
Gastropoda
Serpulidae
spellingShingle Macrofauna
Storm influenced shoreface-shelf
Taphonomy
Valanginian-Hauterivian
benthos
fossil
Hauterivian
sediment analysis
stratigraphy
taphonomy
Valanginian
Argentina
Neuquen Basin
South America
Ammonoidea
Anthozoa
Bivalvia
Gastropoda
Serpulidae
Lazo, D.G.
Taphonomy, time-averaging and lateral transport of the macrofossils of the Pilmatué Member of the Agrio Formation, Lower Cretaceous, Neuquén basin, Argentina
topic_facet Macrofauna
Storm influenced shoreface-shelf
Taphonomy
Valanginian-Hauterivian
benthos
fossil
Hauterivian
sediment analysis
stratigraphy
taphonomy
Valanginian
Argentina
Neuquen Basin
South America
Ammonoidea
Anthozoa
Bivalvia
Gastropoda
Serpulidae
description A taphonomic and sedimentary facies analysis of the Pilmatué Member of the Agrio Formation in central Neuquén basin is presented to determine the time-averaging and degree of lateral transport of its macrofauna. The Pilmatué Member is characterized by abundant fossil concentrations dominated by benthic organisms such as corals, serpulids, bivalves and gastropods. Stratigraphic occurrence of benthic elements was accurately dated by a refined ammonite zonation of the Agrio Formation. Three sections were studied between Chos Malal and Zapala (Neuquén) situated on a north-south line of 44.2 km. Five litofacies and nine taphofacies were defined. The depositonal system is interpreted as a storm influenced homoclinal shoreface to shelf environment. Taphonomic analysis showed that most macrofaunistic associations are autochthonous or slightly parautochthonous with no significant lateral transport. Census, within-habitat time-averaged and environmentally condensed assemblages were identified. Time scales of fossil accumulation span from days-years up to 0.5 My. Nearshore assemblages are less time-averaged than shelf assemblages as in modern settings. © Asociación Paleontológica Argentina.
format JOUR
author Lazo, D.G.
author_facet Lazo, D.G.
author_sort Lazo, D.G.
title Taphonomy, time-averaging and lateral transport of the macrofossils of the Pilmatué Member of the Agrio Formation, Lower Cretaceous, Neuquén basin, Argentina
title_short Taphonomy, time-averaging and lateral transport of the macrofossils of the Pilmatué Member of the Agrio Formation, Lower Cretaceous, Neuquén basin, Argentina
title_full Taphonomy, time-averaging and lateral transport of the macrofossils of the Pilmatué Member of the Agrio Formation, Lower Cretaceous, Neuquén basin, Argentina
title_fullStr Taphonomy, time-averaging and lateral transport of the macrofossils of the Pilmatué Member of the Agrio Formation, Lower Cretaceous, Neuquén basin, Argentina
title_full_unstemmed Taphonomy, time-averaging and lateral transport of the macrofossils of the Pilmatué Member of the Agrio Formation, Lower Cretaceous, Neuquén basin, Argentina
title_sort taphonomy, time-averaging and lateral transport of the macrofossils of the pilmatué member of the agrio formation, lower cretaceous, neuquén basin, argentina
url http://hdl.handle.net/20.500.12110/paper_00027014_v43_n2_p311_Lazo
work_keys_str_mv AT lazodg taphonomytimeaveragingandlateraltransportofthemacrofossilsofthepilmatuememberoftheagrioformationlowercretaceousneuquenbasinargentina
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