A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group
- Autores
- Cordeiro de Castro, Mariela; Goin, Francisco Javier; Ortiz Jaureguizar, Edgardo; Vieytes, Emma Carolina; Tsukui, Kaori; Ramezani, Jahandar; Batezelli, Alessandro; Marsola, Júlio C. A.; Langer, Max C.
- Año de publicación
- 2018
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- In the last three decades, records of tribosphenidan mammals from India, continental Africa, Madagascar and South America have challenged the notion of a strictly Laurasian distribution of the group during the Cretaceous. Here, we describe a lower premolar from the Late Cretaceous Adamantina Formation, São Paulo State, Brazil. It differs from all known fossil mammals, except for a putative eutherian from the same geologic unity and Deccanolestes hislopi, from the Maastrichtian of India. The incompleteness of the material precludes narrowing down its taxonomic attribution further than Tribosphenida, but it is larger than most coeval mammals and shows a thin layer of parallel crystallite enamel. The new taxon helps filling two major gaps in the fossil record: the paucity of Mesozoic mammals in more northern parts of South America and of tribosphenidans in the Cretaceous of that continent. In addition, high-precision U-Pb geochronology provided a post-Turonian maximal age (≤87.8 Ma) for the type stratum, which is overlain by the dinosaur-bearing Marília Formation, constraining the age of the Adamantina Formation at the site to late Coniacian–late Maastrichtian. This represents the first radioisotopic age for the Bauru Group, a key stratigraphic unit for the study of Cretaceous tetrapods in Gondwana.
Facultad de Ciencias Naturales y Museo - Materia
- Ciencias Naturales
- Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/107596
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A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru GroupCordeiro de Castro, MarielaGoin, Francisco JavierOrtiz Jaureguizar, EdgardoVieytes, Emma CarolinaTsukui, KaoriRamezani, JahandarBatezelli, AlessandroMarsola, Júlio C. A.Langer, Max C.Ciencias NaturalesIn the last three decades, records of tribosphenidan mammals from India, continental Africa, Madagascar and South America have challenged the notion of a strictly Laurasian distribution of the group during the Cretaceous. Here, we describe a lower premolar from the Late Cretaceous Adamantina Formation, São Paulo State, Brazil. It differs from all known fossil mammals, except for a putative eutherian from the same geologic unity and Deccanolestes hislopi, from the Maastrichtian of India. The incompleteness of the material precludes narrowing down its taxonomic attribution further than Tribosphenida, but it is larger than most coeval mammals and shows a thin layer of parallel crystallite enamel. The new taxon helps filling two major gaps in the fossil record: the paucity of Mesozoic mammals in more northern parts of South America and of tribosphenidans in the Cretaceous of that continent. In addition, high-precision U-Pb geochronology provided a post-Turonian maximal age (≤87.8 Ma) for the type stratum, which is overlain by the dinosaur-bearing Marília Formation, constraining the age of the Adamantina Formation at the site to late Coniacian–late Maastrichtian. This represents the first radioisotopic age for the Bauru Group, a key stratigraphic unit for the study of Cretaceous tetrapods in Gondwana.Facultad de Ciencias Naturales y Museo2018info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/107596enginfo:eu-repo/semantics/altIdentifier/url/http://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC5990825&blobtype=pdfinfo:eu-repo/semantics/altIdentifier/issn/2054-5703info:eu-repo/semantics/altIdentifier/pmid/29892465info:eu-repo/semantics/altIdentifier/doi/10.1098/rsos.180482info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:23:52Zoai:sedici.unlp.edu.ar:10915/107596Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:23:52.9SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group |
title |
A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group |
spellingShingle |
A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group Cordeiro de Castro, Mariela Ciencias Naturales |
title_short |
A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group |
title_full |
A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group |
title_fullStr |
A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group |
title_full_unstemmed |
A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group |
title_sort |
A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group |
dc.creator.none.fl_str_mv |
Cordeiro de Castro, Mariela Goin, Francisco Javier Ortiz Jaureguizar, Edgardo Vieytes, Emma Carolina Tsukui, Kaori Ramezani, Jahandar Batezelli, Alessandro Marsola, Júlio C. A. Langer, Max C. |
author |
Cordeiro de Castro, Mariela |
author_facet |
Cordeiro de Castro, Mariela Goin, Francisco Javier Ortiz Jaureguizar, Edgardo Vieytes, Emma Carolina Tsukui, Kaori Ramezani, Jahandar Batezelli, Alessandro Marsola, Júlio C. A. Langer, Max C. |
author_role |
author |
author2 |
Goin, Francisco Javier Ortiz Jaureguizar, Edgardo Vieytes, Emma Carolina Tsukui, Kaori Ramezani, Jahandar Batezelli, Alessandro Marsola, Júlio C. A. Langer, Max C. |
author2_role |
author author author author author author author author |
dc.subject.none.fl_str_mv |
Ciencias Naturales |
topic |
Ciencias Naturales |
dc.description.none.fl_txt_mv |
In the last three decades, records of tribosphenidan mammals from India, continental Africa, Madagascar and South America have challenged the notion of a strictly Laurasian distribution of the group during the Cretaceous. Here, we describe a lower premolar from the Late Cretaceous Adamantina Formation, São Paulo State, Brazil. It differs from all known fossil mammals, except for a putative eutherian from the same geologic unity and Deccanolestes hislopi, from the Maastrichtian of India. The incompleteness of the material precludes narrowing down its taxonomic attribution further than Tribosphenida, but it is larger than most coeval mammals and shows a thin layer of parallel crystallite enamel. The new taxon helps filling two major gaps in the fossil record: the paucity of Mesozoic mammals in more northern parts of South America and of tribosphenidans in the Cretaceous of that continent. In addition, high-precision U-Pb geochronology provided a post-Turonian maximal age (≤87.8 Ma) for the type stratum, which is overlain by the dinosaur-bearing Marília Formation, constraining the age of the Adamantina Formation at the site to late Coniacian–late Maastrichtian. This represents the first radioisotopic age for the Bauru Group, a key stratigraphic unit for the study of Cretaceous tetrapods in Gondwana. Facultad de Ciencias Naturales y Museo |
description |
In the last three decades, records of tribosphenidan mammals from India, continental Africa, Madagascar and South America have challenged the notion of a strictly Laurasian distribution of the group during the Cretaceous. Here, we describe a lower premolar from the Late Cretaceous Adamantina Formation, São Paulo State, Brazil. It differs from all known fossil mammals, except for a putative eutherian from the same geologic unity and Deccanolestes hislopi, from the Maastrichtian of India. The incompleteness of the material precludes narrowing down its taxonomic attribution further than Tribosphenida, but it is larger than most coeval mammals and shows a thin layer of parallel crystallite enamel. The new taxon helps filling two major gaps in the fossil record: the paucity of Mesozoic mammals in more northern parts of South America and of tribosphenidans in the Cretaceous of that continent. In addition, high-precision U-Pb geochronology provided a post-Turonian maximal age (≤87.8 Ma) for the type stratum, which is overlain by the dinosaur-bearing Marília Formation, constraining the age of the Adamantina Formation at the site to late Coniacian–late Maastrichtian. This represents the first radioisotopic age for the Bauru Group, a key stratigraphic unit for the study of Cretaceous tetrapods in Gondwana. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018 |
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http://sedici.unlp.edu.ar/handle/10915/107596 |
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dc.language.none.fl_str_mv |
eng |
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eng |
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