Revision of the lower Permian bivalves from the Río Bonito Formation, Paraná Basin, Río Grande do Sul, Brazil

Autores
Dutra, Tânia Lindner; Schmidt Neta, H.
Año de publicación
2010
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Taxonomy of mollusks in lower Permian rocks of southern Brazil is relatively well established for the state of Santa Catarina, where they carry a diversified community of bivalves dominated by Pectinidae (Heteropecten catharinae Reed) accompanied by Trigoniidae (Schizodus occidentalis Reed), Pholadomyidae, Myoconchidae (Stutchburia brasiliensis Reed), Sanguinolitidae?, Crassatelidae (Oriocrassatela itajaiensis Rocha Campos), gastropods, brachiopods and echinoderms. However, in Río Grande do Sul only two forms of this group were previously known, Aviculopecten cambahyensis Martins and Stutchburia sp. New field collections were made in order to attempt testing diversity and taphonomic constrains in these more southern areas. Additionally, samples stored at UNISINOS Museum and collected also at Río Grande do Sul were studied. A total of 313 samples containing right and left valves were tabulated, measured and described. Analysis revealed the dominance -as in Santa Catarina- of disarticulated valves of pectinids (674 forms), represented by dominant A. cambahyensis, Stutchburia sp. (28 valves), and species of two genera not previously described for this region, i.e., Schizodus sp. (7 valves) and Oriocrassatella sp. (one form). The pectinids are dispersed throughout all the eleven meters thick pelitic succession with wavy lamination, but all other elements appear only in the uppermost three meters, accompanied by rare fragments of plants and suggesting an upward shallowing sequence. The basal and upper beds including broad cross-stratified sandstones suggest a deltaic context in a shallow nearshore environment. The lower diversity observed in the southern areas of the basin, where the absence of more typical marine forms is noteworthy, suggests the existence of more stressing conditions possibly linked to colder waters and a consequent low salinity.
Sesiones libres
Facultad de Ciencias Naturales y Museo
Materia
Ciencias Naturales
Paleontología
Permian bivalves
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/16861

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spelling Revision of the lower Permian bivalves from the Río Bonito Formation, Paraná Basin, Río Grande do Sul, BrazilDutra, Tânia LindnerSchmidt Neta, H.Ciencias NaturalesPaleontologíaPermian bivalvesTaxonomy of mollusks in lower Permian rocks of southern Brazil is relatively well established for the state of Santa Catarina, where they carry a diversified community of bivalves dominated by Pectinidae (Heteropecten catharinae Reed) accompanied by Trigoniidae (Schizodus occidentalis Reed), Pholadomyidae, Myoconchidae (Stutchburia brasiliensis Reed), Sanguinolitidae?, Crassatelidae (Oriocrassatela itajaiensis Rocha Campos), gastropods, brachiopods and echinoderms. However, in Río Grande do Sul only two forms of this group were previously known, Aviculopecten cambahyensis Martins and Stutchburia sp. New field collections were made in order to attempt testing diversity and taphonomic constrains in these more southern areas. Additionally, samples stored at UNISINOS Museum and collected also at Río Grande do Sul were studied. A total of 313 samples containing right and left valves were tabulated, measured and described. Analysis revealed the dominance -as in Santa Catarina- of disarticulated valves of pectinids (674 forms), represented by dominant A. cambahyensis, Stutchburia sp. (28 valves), and species of two genera not previously described for this region, i.e., Schizodus sp. (7 valves) and Oriocrassatella sp. (one form). The pectinids are dispersed throughout all the eleven meters thick pelitic succession with wavy lamination, but all other elements appear only in the uppermost three meters, accompanied by rare fragments of plants and suggesting an upward shallowing sequence. The basal and upper beds including broad cross-stratified sandstones suggest a deltaic context in a shallow nearshore environment. The lower diversity observed in the southern areas of the basin, where the absence of more typical marine forms is noteworthy, suggests the existence of more stressing conditions possibly linked to colder waters and a consequent low salinity.Sesiones libresFacultad de Ciencias Naturales y Museo2010info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionResumenhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/16861enginfo:eu-repo/semantics/altIdentifier/isbn/978-987-95849-7-2info:eu-repo/semantics/reference/hdl/10915/25738info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T10:53:02Zoai:sedici.unlp.edu.ar:10915/16861Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 10:53:03.299SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Revision of the lower Permian bivalves from the Río Bonito Formation, Paraná Basin, Río Grande do Sul, Brazil
title Revision of the lower Permian bivalves from the Río Bonito Formation, Paraná Basin, Río Grande do Sul, Brazil
spellingShingle Revision of the lower Permian bivalves from the Río Bonito Formation, Paraná Basin, Río Grande do Sul, Brazil
Dutra, Tânia Lindner
Ciencias Naturales
Paleontología
Permian bivalves
title_short Revision of the lower Permian bivalves from the Río Bonito Formation, Paraná Basin, Río Grande do Sul, Brazil
title_full Revision of the lower Permian bivalves from the Río Bonito Formation, Paraná Basin, Río Grande do Sul, Brazil
title_fullStr Revision of the lower Permian bivalves from the Río Bonito Formation, Paraná Basin, Río Grande do Sul, Brazil
title_full_unstemmed Revision of the lower Permian bivalves from the Río Bonito Formation, Paraná Basin, Río Grande do Sul, Brazil
title_sort Revision of the lower Permian bivalves from the Río Bonito Formation, Paraná Basin, Río Grande do Sul, Brazil
dc.creator.none.fl_str_mv Dutra, Tânia Lindner
Schmidt Neta, H.
author Dutra, Tânia Lindner
author_facet Dutra, Tânia Lindner
Schmidt Neta, H.
author_role author
author2 Schmidt Neta, H.
author2_role author
dc.subject.none.fl_str_mv Ciencias Naturales
Paleontología
Permian bivalves
topic Ciencias Naturales
Paleontología
Permian bivalves
dc.description.none.fl_txt_mv Taxonomy of mollusks in lower Permian rocks of southern Brazil is relatively well established for the state of Santa Catarina, where they carry a diversified community of bivalves dominated by Pectinidae (Heteropecten catharinae Reed) accompanied by Trigoniidae (Schizodus occidentalis Reed), Pholadomyidae, Myoconchidae (Stutchburia brasiliensis Reed), Sanguinolitidae?, Crassatelidae (Oriocrassatela itajaiensis Rocha Campos), gastropods, brachiopods and echinoderms. However, in Río Grande do Sul only two forms of this group were previously known, Aviculopecten cambahyensis Martins and Stutchburia sp. New field collections were made in order to attempt testing diversity and taphonomic constrains in these more southern areas. Additionally, samples stored at UNISINOS Museum and collected also at Río Grande do Sul were studied. A total of 313 samples containing right and left valves were tabulated, measured and described. Analysis revealed the dominance -as in Santa Catarina- of disarticulated valves of pectinids (674 forms), represented by dominant A. cambahyensis, Stutchburia sp. (28 valves), and species of two genera not previously described for this region, i.e., Schizodus sp. (7 valves) and Oriocrassatella sp. (one form). The pectinids are dispersed throughout all the eleven meters thick pelitic succession with wavy lamination, but all other elements appear only in the uppermost three meters, accompanied by rare fragments of plants and suggesting an upward shallowing sequence. The basal and upper beds including broad cross-stratified sandstones suggest a deltaic context in a shallow nearshore environment. The lower diversity observed in the southern areas of the basin, where the absence of more typical marine forms is noteworthy, suggests the existence of more stressing conditions possibly linked to colder waters and a consequent low salinity.
Sesiones libres
Facultad de Ciencias Naturales y Museo
description Taxonomy of mollusks in lower Permian rocks of southern Brazil is relatively well established for the state of Santa Catarina, where they carry a diversified community of bivalves dominated by Pectinidae (Heteropecten catharinae Reed) accompanied by Trigoniidae (Schizodus occidentalis Reed), Pholadomyidae, Myoconchidae (Stutchburia brasiliensis Reed), Sanguinolitidae?, Crassatelidae (Oriocrassatela itajaiensis Rocha Campos), gastropods, brachiopods and echinoderms. However, in Río Grande do Sul only two forms of this group were previously known, Aviculopecten cambahyensis Martins and Stutchburia sp. New field collections were made in order to attempt testing diversity and taphonomic constrains in these more southern areas. Additionally, samples stored at UNISINOS Museum and collected also at Río Grande do Sul were studied. A total of 313 samples containing right and left valves were tabulated, measured and described. Analysis revealed the dominance -as in Santa Catarina- of disarticulated valves of pectinids (674 forms), represented by dominant A. cambahyensis, Stutchburia sp. (28 valves), and species of two genera not previously described for this region, i.e., Schizodus sp. (7 valves) and Oriocrassatella sp. (one form). The pectinids are dispersed throughout all the eleven meters thick pelitic succession with wavy lamination, but all other elements appear only in the uppermost three meters, accompanied by rare fragments of plants and suggesting an upward shallowing sequence. The basal and upper beds including broad cross-stratified sandstones suggest a deltaic context in a shallow nearshore environment. The lower diversity observed in the southern areas of the basin, where the absence of more typical marine forms is noteworthy, suggests the existence of more stressing conditions possibly linked to colder waters and a consequent low salinity.
publishDate 2010
dc.date.none.fl_str_mv 2010
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