Taphonomy and Paleoecology of the Bivalve Trace Fossil Protovirgularia in Deltaic Heterolithic Facies of the Miocene Chenque Formation, Patagonia, Argentina

Autores
Carmona, Noelia Beatriz; Mangano, Maria Gabriela; Buatois, Luis Alberto; Ponce, Juan Jose
Año de publicación
2010
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Lower Miocene tide-influenced deltaic deposits from the Chenque Formation, Patagonia, Argentina, contain abundant and well-preserved biogenic structures attributed to locomotion of deposit-feeder protobranch bivalves. These trace fossils, assigned to the ichnogenus Protovirgularia, consist of delicate, inclined-to-horizontal, chevronate structures, mostly symmetrical with respect to a median axis. Identification of Protovirgularia at sandstone sole beds (hypichnion) is quite straightforward. Endichnial, exichnial and epichnial preservation in heterolithic facies, however, provides a wide variety of forms that depart from the archetypal Protovirgularia and challenges ichnotaxonomic classification. Specimens in prodelta and delta-front facies display morphologic features controlled by substrate fluidity, toponomy, and sedimentation rate. Most specimens show sharp, closely spaced chevrons and occur along sandstone/mudstone interfaces of the proximal prodelta and distal delta-front deposits. These forms reflect how tracemakers experienced significant friction while advancing through the sediment, which resulted in relatively smaller increments of movements. In contrast, variants of Protovirgularia formed in muddier beds, such as in prodeltaic facies, show irregular, poorly defined and unevenly spaced chevrons, and are locally asymmetric in relation to the axis, reflecting softer, water-rich, and plastic substrates. This sediment offered relatively low friction but poor anchorage for the foot. These occurrences of Protovirgularia in tide-influenced, marginal-marine deposits suggests that protobranchs were tolerant of fluctuations in salinity, sedimentation rates, turbidity, and oxygen depletion, displaying opportunistic strategies in stressed nearshore environments. Our evaluation of taphonomic controls and appropriate identification of Protovirgularia can provide valuable information for expanding our knowledge of the ethology and paleoecology of protobranch bivalves.
Fil: Carmona, Noelia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; Argentina
Fil: Mangano, Maria Gabriela. University of Saskatchewan; Canadá. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Buatois, Luis Alberto. University of Saskatchewan; Canadá. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Ponce, Juan Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; Argentina
Materia
Protovirgularia
Ichnology
Miocene
Chenque Formation
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:11336/124963
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/124963
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Taphonomy and Paleoecology of the Bivalve Trace Fossil Protovirgularia in Deltaic Heterolithic Facies of the Miocene Chenque Formation, Patagonia, ArgentinaCarmona, Noelia BeatrizMangano, Maria GabrielaBuatois, Luis AlbertoPonce, Juan JoseProtovirgulariaIchnologyMioceneChenque Formationhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Lower Miocene tide-influenced deltaic deposits from the Chenque Formation, Patagonia, Argentina, contain abundant and well-preserved biogenic structures attributed to locomotion of deposit-feeder protobranch bivalves. These trace fossils, assigned to the ichnogenus Protovirgularia, consist of delicate, inclined-to-horizontal, chevronate structures, mostly symmetrical with respect to a median axis. Identification of Protovirgularia at sandstone sole beds (hypichnion) is quite straightforward. Endichnial, exichnial and epichnial preservation in heterolithic facies, however, provides a wide variety of forms that depart from the archetypal Protovirgularia and challenges ichnotaxonomic classification. Specimens in prodelta and delta-front facies display morphologic features controlled by substrate fluidity, toponomy, and sedimentation rate. Most specimens show sharp, closely spaced chevrons and occur along sandstone/mudstone interfaces of the proximal prodelta and distal delta-front deposits. These forms reflect how tracemakers experienced significant friction while advancing through the sediment, which resulted in relatively smaller increments of movements. In contrast, variants of Protovirgularia formed in muddier beds, such as in prodeltaic facies, show irregular, poorly defined and unevenly spaced chevrons, and are locally asymmetric in relation to the axis, reflecting softer, water-rich, and plastic substrates. This sediment offered relatively low friction but poor anchorage for the foot. These occurrences of Protovirgularia in tide-influenced, marginal-marine deposits suggests that protobranchs were tolerant of fluctuations in salinity, sedimentation rates, turbidity, and oxygen depletion, displaying opportunistic strategies in stressed nearshore environments. Our evaluation of taphonomic controls and appropriate identification of Protovirgularia can provide valuable information for expanding our knowledge of the ethology and paleoecology of protobranch bivalves.Fil: Carmona, Noelia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; ArgentinaFil: Mangano, Maria Gabriela. University of Saskatchewan; Canadá. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Buatois, Luis Alberto. University of Saskatchewan; Canadá. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Ponce, Juan Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; ArgentinaPaleontological Society2010-07-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/124963Carmona, Noelia Beatriz; Mangano, Maria Gabriela; Buatois, Luis Alberto; Ponce, Juan Jose; Taphonomy and Paleoecology of the Bivalve Trace Fossil Protovirgularia in Deltaic Heterolithic Facies of the Miocene Chenque Formation, Patagonia, Argentina; Paleontological Society; Journal of Paleontology; 84; 4; 1-7-2010; 730-7380022-3360CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://bioone.org/journals/journal-of-paleontology/volume-84/issue-4/09-119.1/Taphonomy-and-Paleoecology-of-the-Bivalve-Trace-Fossil-Protovirgularia-in/10.1666/09-119.1.shortinfo:eu-repo/semantics/altIdentifier/doi/10.1666/09-119.1info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-17T11:03:19Zoai:ri.conicet.gov.ar:11336/124963instacron: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:34982025-09-17 11:03:19.637CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Taphonomy and Paleoecology of the Bivalve Trace Fossil Protovirgularia in Deltaic Heterolithic Facies of the Miocene Chenque Formation, Patagonia, Argentina
title Taphonomy and Paleoecology of the Bivalve Trace Fossil Protovirgularia in Deltaic Heterolithic Facies of the Miocene Chenque Formation, Patagonia, Argentina
spellingShingle Taphonomy and Paleoecology of the Bivalve Trace Fossil Protovirgularia in Deltaic Heterolithic Facies of the Miocene Chenque Formation, Patagonia, Argentina
Carmona, Noelia Beatriz
Protovirgularia
Ichnology
Miocene
Chenque Formation
title_short Taphonomy and Paleoecology of the Bivalve Trace Fossil Protovirgularia in Deltaic Heterolithic Facies of the Miocene Chenque Formation, Patagonia, Argentina
title_full Taphonomy and Paleoecology of the Bivalve Trace Fossil Protovirgularia in Deltaic Heterolithic Facies of the Miocene Chenque Formation, Patagonia, Argentina
title_fullStr Taphonomy and Paleoecology of the Bivalve Trace Fossil Protovirgularia in Deltaic Heterolithic Facies of the Miocene Chenque Formation, Patagonia, Argentina
title_full_unstemmed Taphonomy and Paleoecology of the Bivalve Trace Fossil Protovirgularia in Deltaic Heterolithic Facies of the Miocene Chenque Formation, Patagonia, Argentina
title_sort Taphonomy and Paleoecology of the Bivalve Trace Fossil Protovirgularia in Deltaic Heterolithic Facies of the Miocene Chenque Formation, Patagonia, Argentina
dc.creator.none.fl_str_mv Carmona, Noelia Beatriz
Mangano, Maria Gabriela
Buatois, Luis Alberto
Ponce, Juan Jose
author Carmona, Noelia Beatriz
author_facet Carmona, Noelia Beatriz
Mangano, Maria Gabriela
Buatois, Luis Alberto
Ponce, Juan Jose
author_role author
author2 Mangano, Maria Gabriela
Buatois, Luis Alberto
Ponce, Juan Jose
author2_role author
author
author
dc.subject.none.fl_str_mv Protovirgularia
Ichnology
Miocene
Chenque Formation
topic Protovirgularia
Ichnology
Miocene
Chenque Formation
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Lower Miocene tide-influenced deltaic deposits from the Chenque Formation, Patagonia, Argentina, contain abundant and well-preserved biogenic structures attributed to locomotion of deposit-feeder protobranch bivalves. These trace fossils, assigned to the ichnogenus Protovirgularia, consist of delicate, inclined-to-horizontal, chevronate structures, mostly symmetrical with respect to a median axis. Identification of Protovirgularia at sandstone sole beds (hypichnion) is quite straightforward. Endichnial, exichnial and epichnial preservation in heterolithic facies, however, provides a wide variety of forms that depart from the archetypal Protovirgularia and challenges ichnotaxonomic classification. Specimens in prodelta and delta-front facies display morphologic features controlled by substrate fluidity, toponomy, and sedimentation rate. Most specimens show sharp, closely spaced chevrons and occur along sandstone/mudstone interfaces of the proximal prodelta and distal delta-front deposits. These forms reflect how tracemakers experienced significant friction while advancing through the sediment, which resulted in relatively smaller increments of movements. In contrast, variants of Protovirgularia formed in muddier beds, such as in prodeltaic facies, show irregular, poorly defined and unevenly spaced chevrons, and are locally asymmetric in relation to the axis, reflecting softer, water-rich, and plastic substrates. This sediment offered relatively low friction but poor anchorage for the foot. These occurrences of Protovirgularia in tide-influenced, marginal-marine deposits suggests that protobranchs were tolerant of fluctuations in salinity, sedimentation rates, turbidity, and oxygen depletion, displaying opportunistic strategies in stressed nearshore environments. Our evaluation of taphonomic controls and appropriate identification of Protovirgularia can provide valuable information for expanding our knowledge of the ethology and paleoecology of protobranch bivalves.
Fil: Carmona, Noelia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; Argentina
Fil: Mangano, Maria Gabriela. University of Saskatchewan; Canadá. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Buatois, Luis Alberto. University of Saskatchewan; Canadá. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Ponce, Juan Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Argentino de Oceanografía. Universidad Nacional del Sur. Instituto Argentino de Oceanografía; Argentina
description Lower Miocene tide-influenced deltaic deposits from the Chenque Formation, Patagonia, Argentina, contain abundant and well-preserved biogenic structures attributed to locomotion of deposit-feeder protobranch bivalves. These trace fossils, assigned to the ichnogenus Protovirgularia, consist of delicate, inclined-to-horizontal, chevronate structures, mostly symmetrical with respect to a median axis. Identification of Protovirgularia at sandstone sole beds (hypichnion) is quite straightforward. Endichnial, exichnial and epichnial preservation in heterolithic facies, however, provides a wide variety of forms that depart from the archetypal Protovirgularia and challenges ichnotaxonomic classification. Specimens in prodelta and delta-front facies display morphologic features controlled by substrate fluidity, toponomy, and sedimentation rate. Most specimens show sharp, closely spaced chevrons and occur along sandstone/mudstone interfaces of the proximal prodelta and distal delta-front deposits. These forms reflect how tracemakers experienced significant friction while advancing through the sediment, which resulted in relatively smaller increments of movements. In contrast, variants of Protovirgularia formed in muddier beds, such as in prodeltaic facies, show irregular, poorly defined and unevenly spaced chevrons, and are locally asymmetric in relation to the axis, reflecting softer, water-rich, and plastic substrates. This sediment offered relatively low friction but poor anchorage for the foot. These occurrences of Protovirgularia in tide-influenced, marginal-marine deposits suggests that protobranchs were tolerant of fluctuations in salinity, sedimentation rates, turbidity, and oxygen depletion, displaying opportunistic strategies in stressed nearshore environments. Our evaluation of taphonomic controls and appropriate identification of Protovirgularia can provide valuable information for expanding our knowledge of the ethology and paleoecology of protobranch bivalves.
publishDate 2010
dc.date.none.fl_str_mv 2010-07-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/124963
Carmona, Noelia Beatriz; Mangano, Maria Gabriela; Buatois, Luis Alberto; Ponce, Juan Jose; Taphonomy and Paleoecology of the Bivalve Trace Fossil Protovirgularia in Deltaic Heterolithic Facies of the Miocene Chenque Formation, Patagonia, Argentina; Paleontological Society; Journal of Paleontology; 84; 4; 1-7-2010; 730-738
0022-3360
CONICET Digital
CONICET
url http://hdl.handle.net/11336/124963
identifier_str_mv Carmona, Noelia Beatriz; Mangano, Maria Gabriela; Buatois, Luis Alberto; Ponce, Juan Jose; Taphonomy and Paleoecology of the Bivalve Trace Fossil Protovirgularia in Deltaic Heterolithic Facies of the Miocene Chenque Formation, Patagonia, Argentina; Paleontological Society; Journal of Paleontology; 84; 4; 1-7-2010; 730-738
0022-3360
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://bioone.org/journals/journal-of-paleontology/volume-84/issue-4/09-119.1/Taphonomy-and-Paleoecology-of-the-Bivalve-Trace-Fossil-Protovirgularia-in/10.1666/09-119.1.short
info:eu-repo/semantics/altIdentifier/doi/10.1666/09-119.1
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Paleontological Society
publisher.none.fl_str_mv Paleontological Society
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.001348

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