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dc.contributor.author
Lazo, Dario Gustavo
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dc.contributor.author
Remirez, Mariano Nicolas
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dc.contributor.author
Schwarz, Ernesto
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dc.contributor.author
Thuy, Ben
dc.date.available
2024-04-30T13:12:46Z
dc.date.issued
2017
dc.identifier.citation
Taphonomy of brittle stars associated with a tempestite bed from the Lower Cretaceous Agrio Formation of the Neuquén Basin, west-central Argentina; 8th International Meeting on Taphonomy and Fossilization; Viena; Austria; 2017; 71-71
dc.identifier.uri
http://hdl.handle.net/11336/234277
dc.description.abstract
Exceptionally preserved brittle stars have been recently recorded from the Agrio Formation, Neuquén Basin, west-central Argentina. This basin extends between 32º and 40º S in the Andes foothills of west-central Argentina, covering more than 120.000 km2 of surface and comprising a continuous Latest Triassic to Early Tertiary sedimentary succession. It holds one of the most complete records of Jurassic and Cretaceous marine invertebrates of South America. The studied ophiuroid specimens were recorded from a single stratigraphic level of the Pilmatué Member, and dated as early Hauterivian age, based on associated ammonoids. The unit has been interpreted as deposited in a mixed clastic-carbonate, storm-influenced shallow-marine setting and has a highly abundant and diverse fossil content including nannofossils, microfossils, palynomorphs and marine invertebrates and reptiles, but extremely scarce echinoderm records except for irregular echinoids, which are locally abundant. The ophiuroids belong to a monotypic association of Eozonella sp., which was a widespread group on the continental shelves from the Middle Jurassic to the Early Cretaceous. Specimens are placed at, or near, the base of a single tempestite sandstone bed (up to 5 cm thick), likely deposited in a proximal offshore setting. Two sandstone samples were collected for study and named A and B. Sandstone Sample A includes 6 articulated specimens, while sample B includes 3 articulated ones. Five of them are oriented oral side up while the remaining 4 are placed oral side down. There are also dispersed fragments of arms and isolated ossicles among the mentioned specimens. Dispersed small isolated bivalve shells are also recorded in the same bed in convex-up orientation. Based on thaphonomic evidence, the ophiuroids underwent in situ storm reworking while alive, and were rapidly (and permanently) buried during subsequent sand accumulation. In recent (modern?/Cainozoic?) settings brittle stars typically disarticulate shortly after death due to decay of the connecting soft tissues, and thus they are only occasionally preserved articulated in the fossil record. This present finding is key to characterize the taphonomy of asterozoans associated to storm beds, but also provides an insight into Early Cretaceous ophiuroid paleoecology and evolution in the Southeastern Pacific.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
University of Wien
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
BRITTLE STARS
dc.subject
TEMPESTITE
dc.subject
AGRIO FM
dc.subject
NEUQUEN BASIN
dc.subject.classification
Paleontología
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Taphonomy of brittle stars associated with a tempestite bed from the Lower Cretaceous Agrio Formation of the Neuquén Basin, west-central Argentina
dc.type
info:eu-repo/semantics/publishedVersion
dc.type
info:eu-repo/semantics/conferenceObject
dc.type
info:ar-repo/semantics/documento de conferencia
dc.date.updated
2024-04-23T13:20:25Z
dc.journal.pagination
71-71
dc.journal.pais
Austria
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dc.journal.ciudad
Wien
dc.description.fil
Fil: Lazo, Dario Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
dc.description.fil
Fil: Remirez, Mariano Nicolas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
dc.description.fil
Fil: Schwarz, Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Investigaciones Geológicas. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Investigaciones Geológicas; Argentina
dc.description.fil
Fil: Thuy, Ben. Musée National D'histoire Naturelle; Luxemburgo
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://taphos2017.univie.ac.at/program/
dc.conicet.rol
Autor
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Autor
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dc.conicet.rol
Autor
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dc.conicet.rol
Autor
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dc.coverage
Internacional
dc.type.subtype
Reunión
dc.description.nombreEvento
8th International Meeting on Taphonomy and Fossilization
dc.date.evento
2017-09-14
dc.description.ciudadEvento
Viena
dc.description.paisEvento
Austria
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dc.type.publicacion
Book
dc.description.institucionOrganizadora
University of Vienna
dc.description.institucionOrganizadora
Natural History Museum Vienna
dc.source.libro
8th International Meeting on Taphonomy and Fossilization
dc.date.eventoHasta
2017-09-17
dc.type
Reunión
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