The continental Triassic faunal succession of southern Brazil

Autores
Schultz, C.; Langer, M. C.
Año de publicación
2010
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The south Brazilian Triassic package comprises two second-order depositional sequences: Sanga do Cabral (Early Triassic) and Santa Maria (Middle-Late Triassic) supersequences, separated by an unconformity. The first one includes ephemeral, low sinuosity fluvial deposits developed on a low gradient floodplain. The presence of rhytidosteid amphibians and procolophonids (Procolophon) suggests a late Induan age for this sequence. By its turn, facies association of the Santa Maria Supersequence indicates low-sinuosity fluvial rivers, deltas and lakes. This supersequence can be further subdivided into three third-order sequences as follows: Santa Maria 1 (SM1 -Ladinian), Santa Maria 2 (SM2 - Carnian-early Norian) and Santa Maria 3 (SM3 - probably Rhaetian) sequences. The first one encompasses two distinct biozones: Dinodontosaurus Zone (=Therapsid Cenozone), basal, dominated by dicynodonts (Dinodontosaurus), cynodonts (Massetognathus) and Rauisuchians (Prestosuchus), which is coeval to the Los Chañares Fauna from the Bermejo Basin, Argentina; and Traversodontid Biozone, characterized by an almost exclusive record of traversodontid cynodonts, including Santacruzodon and Menadon, which also occurs in the Isalo II sequence from Madagascar. The SM2 also includes two biozones, from base to top: Hyperodapedon Zone (=Rhynchosauria Cenozone) with an expressive presence of rhynchosaurs (Hyperodapedon), followed by cynodonts (mainly Exaeretodon), basal dinosaurs (Staurikosaurus, Saturnalia) and a total absence of dicynodonts; and Mammaliamorpha Cenozone (= Ictidosauria Cenozone) with a fauna dominated by little "ictidosaurian" cynodonts (mainly Riograndia). The presence of Hyperodapedon and Exaeretodon in the Hyperodapedon Zone indicates that it is coeval with the lower fauna of the Ischigualasto Formation, Bermejo Basin, Argentina. On the other hand, the record of the dicynodont Jachaleria in the upper biozone indicates a correlation with the lower part of the Los Colorados Formation, Argentina. Finally, the SM3 is constituted by coarse-grained sediments suggesting high-energy flows. The fossil record does not include vertebrates but only conifer and ginkgo silicified logs, which not provide a precise age to this section.
Simposio III: Ecosistemas triásicos, su paleobiología y el contexto de recuperación de la gran extinción
Facultad de Ciencias Naturales y Museo
Materia
Ciencias Naturales
Paleontología
Brasil
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:10915/16657

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network_name_str SEDICI (UNLP)
spelling The continental Triassic faunal succession of southern BrazilSchultz, C.Langer, M. C.Ciencias NaturalesPaleontologíaBrasilThe south Brazilian Triassic package comprises two second-order depositional sequences: Sanga do Cabral (Early Triassic) and Santa Maria (Middle-Late Triassic) supersequences, separated by an unconformity. The first one includes ephemeral, low sinuosity fluvial deposits developed on a low gradient floodplain. The presence of rhytidosteid amphibians and procolophonids (Procolophon) suggests a late Induan age for this sequence. By its turn, facies association of the Santa Maria Supersequence indicates low-sinuosity fluvial rivers, deltas and lakes. This supersequence can be further subdivided into three third-order sequences as follows: Santa Maria 1 (SM1 -Ladinian), Santa Maria 2 (SM2 - Carnian-early Norian) and Santa Maria 3 (SM3 - probably Rhaetian) sequences. The first one encompasses two distinct biozones: Dinodontosaurus Zone (=Therapsid Cenozone), basal, dominated by dicynodonts (Dinodontosaurus), cynodonts (Massetognathus) and Rauisuchians (Prestosuchus), which is coeval to the Los Chañares Fauna from the Bermejo Basin, Argentina; and Traversodontid Biozone, characterized by an almost exclusive record of traversodontid cynodonts, including Santacruzodon and Menadon, which also occurs in the Isalo II sequence from Madagascar. The SM2 also includes two biozones, from base to top: Hyperodapedon Zone (=Rhynchosauria Cenozone) with an expressive presence of rhynchosaurs (Hyperodapedon), followed by cynodonts (mainly Exaeretodon), basal dinosaurs (Staurikosaurus, Saturnalia) and a total absence of dicynodonts; and Mammaliamorpha Cenozone (= Ictidosauria Cenozone) with a fauna dominated by little "ictidosaurian" cynodonts (mainly Riograndia). The presence of Hyperodapedon and Exaeretodon in the Hyperodapedon Zone indicates that it is coeval with the lower fauna of the Ischigualasto Formation, Bermejo Basin, Argentina. On the other hand, the record of the dicynodont Jachaleria in the upper biozone indicates a correlation with the lower part of the Los Colorados Formation, Argentina. Finally, the SM3 is constituted by coarse-grained sediments suggesting high-energy flows. The fossil record does not include vertebrates but only conifer and ginkgo silicified logs, which not provide a precise age to this section.Simposio III: Ecosistemas triásicos, su paleobiología y el contexto de recuperación de la gran extinciónFacultad 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/10915/16657enginfo: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:UNLP2025-09-29T10:52:58Zoai:sedici.unlp.edu.ar:10915/16657Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 10:52:58.437SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv The continental Triassic faunal succession of southern Brazil
title The continental Triassic faunal succession of southern Brazil
spellingShingle The continental Triassic faunal succession of southern Brazil
Schultz, C.
Ciencias Naturales
Paleontología
Brasil
title_short The continental Triassic faunal succession of southern Brazil
title_full The continental Triassic faunal succession of southern Brazil
title_fullStr The continental Triassic faunal succession of southern Brazil
title_full_unstemmed The continental Triassic faunal succession of southern Brazil
title_sort The continental Triassic faunal succession of southern Brazil
dc.creator.none.fl_str_mv Schultz, C.
Langer, M. C.
author Schultz, C.
author_facet Schultz, C.
Langer, M. C.
author_role author
author2 Langer, M. C.
author2_role author
dc.subject.none.fl_str_mv Ciencias Naturales
Paleontología
Brasil
topic Ciencias Naturales
Paleontología
Brasil
dc.description.none.fl_txt_mv The south Brazilian Triassic package comprises two second-order depositional sequences: Sanga do Cabral (Early Triassic) and Santa Maria (Middle-Late Triassic) supersequences, separated by an unconformity. The first one includes ephemeral, low sinuosity fluvial deposits developed on a low gradient floodplain. The presence of rhytidosteid amphibians and procolophonids (Procolophon) suggests a late Induan age for this sequence. By its turn, facies association of the Santa Maria Supersequence indicates low-sinuosity fluvial rivers, deltas and lakes. This supersequence can be further subdivided into three third-order sequences as follows: Santa Maria 1 (SM1 -Ladinian), Santa Maria 2 (SM2 - Carnian-early Norian) and Santa Maria 3 (SM3 - probably Rhaetian) sequences. The first one encompasses two distinct biozones: Dinodontosaurus Zone (=Therapsid Cenozone), basal, dominated by dicynodonts (Dinodontosaurus), cynodonts (Massetognathus) and Rauisuchians (Prestosuchus), which is coeval to the Los Chañares Fauna from the Bermejo Basin, Argentina; and Traversodontid Biozone, characterized by an almost exclusive record of traversodontid cynodonts, including Santacruzodon and Menadon, which also occurs in the Isalo II sequence from Madagascar. The SM2 also includes two biozones, from base to top: Hyperodapedon Zone (=Rhynchosauria Cenozone) with an expressive presence of rhynchosaurs (Hyperodapedon), followed by cynodonts (mainly Exaeretodon), basal dinosaurs (Staurikosaurus, Saturnalia) and a total absence of dicynodonts; and Mammaliamorpha Cenozone (= Ictidosauria Cenozone) with a fauna dominated by little "ictidosaurian" cynodonts (mainly Riograndia). The presence of Hyperodapedon and Exaeretodon in the Hyperodapedon Zone indicates that it is coeval with the lower fauna of the Ischigualasto Formation, Bermejo Basin, Argentina. On the other hand, the record of the dicynodont Jachaleria in the upper biozone indicates a correlation with the lower part of the Los Colorados Formation, Argentina. Finally, the SM3 is constituted by coarse-grained sediments suggesting high-energy flows. The fossil record does not include vertebrates but only conifer and ginkgo silicified logs, which not provide a precise age to this section.
Simposio III: Ecosistemas triásicos, su paleobiología y el contexto de recuperación de la gran extinción
Facultad de Ciencias Naturales y Museo
description The south Brazilian Triassic package comprises two second-order depositional sequences: Sanga do Cabral (Early Triassic) and Santa Maria (Middle-Late Triassic) supersequences, separated by an unconformity. The first one includes ephemeral, low sinuosity fluvial deposits developed on a low gradient floodplain. The presence of rhytidosteid amphibians and procolophonids (Procolophon) suggests a late Induan age for this sequence. By its turn, facies association of the Santa Maria Supersequence indicates low-sinuosity fluvial rivers, deltas and lakes. This supersequence can be further subdivided into three third-order sequences as follows: Santa Maria 1 (SM1 -Ladinian), Santa Maria 2 (SM2 - Carnian-early Norian) and Santa Maria 3 (SM3 - probably Rhaetian) sequences. The first one encompasses two distinct biozones: Dinodontosaurus Zone (=Therapsid Cenozone), basal, dominated by dicynodonts (Dinodontosaurus), cynodonts (Massetognathus) and Rauisuchians (Prestosuchus), which is coeval to the Los Chañares Fauna from the Bermejo Basin, Argentina; and Traversodontid Biozone, characterized by an almost exclusive record of traversodontid cynodonts, including Santacruzodon and Menadon, which also occurs in the Isalo II sequence from Madagascar. The SM2 also includes two biozones, from base to top: Hyperodapedon Zone (=Rhynchosauria Cenozone) with an expressive presence of rhynchosaurs (Hyperodapedon), followed by cynodonts (mainly Exaeretodon), basal dinosaurs (Staurikosaurus, Saturnalia) and a total absence of dicynodonts; and Mammaliamorpha Cenozone (= Ictidosauria Cenozone) with a fauna dominated by little "ictidosaurian" cynodonts (mainly Riograndia). The presence of Hyperodapedon and Exaeretodon in the Hyperodapedon Zone indicates that it is coeval with the lower fauna of the Ischigualasto Formation, Bermejo Basin, Argentina. On the other hand, the record of the dicynodont Jachaleria in the upper biozone indicates a correlation with the lower part of the Los Colorados Formation, Argentina. Finally, the SM3 is constituted by coarse-grained sediments suggesting high-energy flows. The fossil record does not include vertebrates but only conifer and ginkgo silicified logs, which not provide a precise age to this section.
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