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
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/107596

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spelling 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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info:eu-repo/semantics/altIdentifier/pmid/29892465
info:eu-repo/semantics/altIdentifier/doi/10.1098/rsos.180482
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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