Exceptional preservation of Spaeraphus larvalis in the Miocene Vinchina Formation of western Argentina

Autores
Alonso Muruaga, Pablo Joaquin; Krapovickas, Verónica
Año de publicación
2016
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The Miocene Vinchina Formation of western Argentina is made up of more than 5100 meters of siliciclastic sediments deposited mostly in fluvial environments, including transitions from braided and meandering, to anastomosed systems. The Upper Member of the unit is characterized by the conspicuous occurrence of braided fluvial deposits, composed of heterolitic multistory channels, gravelly bars, sandy bars, and very thin intercalations of floodplain fines facies, hosting invertebrate and vertebrate trace-fossils assemblages. The present contribution deals with the outstanding preservation of Spaeraphus within these facies. In particular, the ichnofossils studied were recorded at the sole of a massive fine to very fine-grained sandstone bed interbedded with laminated claystones and siltstones, representing overbank sedimentation during flooding episodes. The trace Spaeraphus larvalis occurs as a positive or negative hyporelief. As positive epirelief is characterized by several horizontal burrows displaying raised, often imbricated, oval blocks generating nodular margins, and sometimes developing a discontinuous open medial depression. Occasionally, the medial depression is irregularly filled by smaller blocks. Individual blocks are smooth, subrounded to oval, 1? 4 mm in diameter, and identical in composition to the surrounding matrix. The burrow widths vary from 4 about 12 mm, and their courses are mostly straight with gentle curves with length of decimeter scale. Primary successive branching and intersecting of burrows are also seen. Ongoing research suggests that these traces reflect a shallow dwelling behavior in soft, fine grained substrates subaerially exposed but proximal to the water table as channel margins, interchannel areas, and marginal zones of local ponds.
Fil: Alonso Muruaga, Pablo Joaquin. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Krapovickas, Verónica. 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
4th International Congress on Ichnology
Idanha-a-Nova
Portugal
International Ichnological Association
Materia
Trace fossils
Vinchina
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/242529
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Exceptional preservation of Spaeraphus larvalis in the Miocene Vinchina Formation of western ArgentinaAlonso Muruaga, Pablo JoaquinKrapovickas, VerónicaTrace fossilsVinchinahttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Miocene Vinchina Formation of western Argentina is made up of more than 5100 meters of siliciclastic sediments deposited mostly in fluvial environments, including transitions from braided and meandering, to anastomosed systems. The Upper Member of the unit is characterized by the conspicuous occurrence of braided fluvial deposits, composed of heterolitic multistory channels, gravelly bars, sandy bars, and very thin intercalations of floodplain fines facies, hosting invertebrate and vertebrate trace-fossils assemblages. The present contribution deals with the outstanding preservation of Spaeraphus within these facies. In particular, the ichnofossils studied were recorded at the sole of a massive fine to very fine-grained sandstone bed interbedded with laminated claystones and siltstones, representing overbank sedimentation during flooding episodes. The trace Spaeraphus larvalis occurs as a positive or negative hyporelief. As positive epirelief is characterized by several horizontal burrows displaying raised, often imbricated, oval blocks generating nodular margins, and sometimes developing a discontinuous open medial depression. Occasionally, the medial depression is irregularly filled by smaller blocks. Individual blocks are smooth, subrounded to oval, 1? 4 mm in diameter, and identical in composition to the surrounding matrix. The burrow widths vary from 4 about 12 mm, and their courses are mostly straight with gentle curves with length of decimeter scale. Primary successive branching and intersecting of burrows are also seen. Ongoing research suggests that these traces reflect a shallow dwelling behavior in soft, fine grained substrates subaerially exposed but proximal to the water table as channel margins, interchannel areas, and marginal zones of local ponds.Fil: Alonso Muruaga, Pablo Joaquin. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Krapovickas, Verónica. 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"; Argentina4th International Congress on IchnologyIdanha-a-NovaPortugalInternational Ichnological AssociationInternational Ichnological Association2016info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectCongresoBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/vnd.openxmlformats-officedocument.wordprocessingml.documentapplication/pdfhttp://hdl.handle.net/11336/242529Exceptional preservation of Spaeraphus larvalis in the Miocene Vinchina Formation of western Argentina; 4th International Congress on Ichnology; Idanha-a-Nova; Portugal; 2016; 120-120978-989-97888-1-7CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.palass.org/meetings-events/future-meetings/4th-international-congress-ichnology-ichnia-2016info:eu-repo/semantics/altIdentifier/url/https://www.naturtejo.com/ficheiros/conteudos/files/ichnia16livro.pdfInternacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:10:33Zoai:ri.conicet.gov.ar:11336/242529instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-10 13:10:33.925CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Exceptional preservation of Spaeraphus larvalis in the Miocene Vinchina Formation of western Argentina
title Exceptional preservation of Spaeraphus larvalis in the Miocene Vinchina Formation of western Argentina
spellingShingle Exceptional preservation of Spaeraphus larvalis in the Miocene Vinchina Formation of western Argentina
Alonso Muruaga, Pablo Joaquin
Trace fossils
Vinchina
title_short Exceptional preservation of Spaeraphus larvalis in the Miocene Vinchina Formation of western Argentina
title_full Exceptional preservation of Spaeraphus larvalis in the Miocene Vinchina Formation of western Argentina
title_fullStr Exceptional preservation of Spaeraphus larvalis in the Miocene Vinchina Formation of western Argentina
title_full_unstemmed Exceptional preservation of Spaeraphus larvalis in the Miocene Vinchina Formation of western Argentina
title_sort Exceptional preservation of Spaeraphus larvalis in the Miocene Vinchina Formation of western Argentina
dc.creator.none.fl_str_mv Alonso Muruaga, Pablo Joaquin
Krapovickas, Verónica
author Alonso Muruaga, Pablo Joaquin
author_facet Alonso Muruaga, Pablo Joaquin
Krapovickas, Verónica
author_role author
author2 Krapovickas, Verónica
author2_role author
dc.subject.none.fl_str_mv Trace fossils
Vinchina
topic Trace fossils
Vinchina
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The Miocene Vinchina Formation of western Argentina is made up of more than 5100 meters of siliciclastic sediments deposited mostly in fluvial environments, including transitions from braided and meandering, to anastomosed systems. The Upper Member of the unit is characterized by the conspicuous occurrence of braided fluvial deposits, composed of heterolitic multistory channels, gravelly bars, sandy bars, and very thin intercalations of floodplain fines facies, hosting invertebrate and vertebrate trace-fossils assemblages. The present contribution deals with the outstanding preservation of Spaeraphus within these facies. In particular, the ichnofossils studied were recorded at the sole of a massive fine to very fine-grained sandstone bed interbedded with laminated claystones and siltstones, representing overbank sedimentation during flooding episodes. The trace Spaeraphus larvalis occurs as a positive or negative hyporelief. As positive epirelief is characterized by several horizontal burrows displaying raised, often imbricated, oval blocks generating nodular margins, and sometimes developing a discontinuous open medial depression. Occasionally, the medial depression is irregularly filled by smaller blocks. Individual blocks are smooth, subrounded to oval, 1? 4 mm in diameter, and identical in composition to the surrounding matrix. The burrow widths vary from 4 about 12 mm, and their courses are mostly straight with gentle curves with length of decimeter scale. Primary successive branching and intersecting of burrows are also seen. Ongoing research suggests that these traces reflect a shallow dwelling behavior in soft, fine grained substrates subaerially exposed but proximal to the water table as channel margins, interchannel areas, and marginal zones of local ponds.
Fil: Alonso Muruaga, Pablo Joaquin. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; Argentina
Fil: Krapovickas, Verónica. 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
4th International Congress on Ichnology
Idanha-a-Nova
Portugal
International Ichnological Association
description The Miocene Vinchina Formation of western Argentina is made up of more than 5100 meters of siliciclastic sediments deposited mostly in fluvial environments, including transitions from braided and meandering, to anastomosed systems. The Upper Member of the unit is characterized by the conspicuous occurrence of braided fluvial deposits, composed of heterolitic multistory channels, gravelly bars, sandy bars, and very thin intercalations of floodplain fines facies, hosting invertebrate and vertebrate trace-fossils assemblages. The present contribution deals with the outstanding preservation of Spaeraphus within these facies. In particular, the ichnofossils studied were recorded at the sole of a massive fine to very fine-grained sandstone bed interbedded with laminated claystones and siltstones, representing overbank sedimentation during flooding episodes. The trace Spaeraphus larvalis occurs as a positive or negative hyporelief. As positive epirelief is characterized by several horizontal burrows displaying raised, often imbricated, oval blocks generating nodular margins, and sometimes developing a discontinuous open medial depression. Occasionally, the medial depression is irregularly filled by smaller blocks. Individual blocks are smooth, subrounded to oval, 1? 4 mm in diameter, and identical in composition to the surrounding matrix. The burrow widths vary from 4 about 12 mm, and their courses are mostly straight with gentle curves with length of decimeter scale. Primary successive branching and intersecting of burrows are also seen. Ongoing research suggests that these traces reflect a shallow dwelling behavior in soft, fine grained substrates subaerially exposed but proximal to the water table as channel margins, interchannel areas, and marginal zones of local ponds.
publishDate 2016
dc.date.none.fl_str_mv 2016
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Congreso
Book
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info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/242529
Exceptional preservation of Spaeraphus larvalis in the Miocene Vinchina Formation of western Argentina; 4th International Congress on Ichnology; Idanha-a-Nova; Portugal; 2016; 120-120
978-989-97888-1-7
CONICET Digital
CONICET
url http://hdl.handle.net/11336/242529
identifier_str_mv Exceptional preservation of Spaeraphus larvalis in the Miocene Vinchina Formation of western Argentina; 4th International Congress on Ichnology; Idanha-a-Nova; Portugal; 2016; 120-120
978-989-97888-1-7
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.palass.org/meetings-events/future-meetings/4th-international-congress-ichnology-ichnia-2016
info:eu-repo/semantics/altIdentifier/url/https://www.naturtejo.com/ficheiros/conteudos/files/ichnia16livro.pdf
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dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv International Ichnological Association
publisher.none.fl_str_mv International Ichnological Association
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