Dawn of diverse shelled and carbonaceous animal microfossils at ~ 571 Ma.

Autor: Morais L; Department of Geophysics, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo (USP), São Paulo, SP, Brazil. lumoraiss@ymail.com.; Department of Geology, São Paulo State University (UNESP), Rio Claro, 13506-900, Brazil. lumoraiss@ymail.com., Freitas BT; Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brazil. freitasb@unicamp.br., Fairchild TR; Institute of Geosciences, University of São Paulo (USP), São Paulo, SP, Brazil., Clavijo Arcos RE; Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zurich, Clausiusstrasse 25, 8092, Zurich, Switzerland., Guillong M; Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zurich, Clausiusstrasse 25, 8092, Zurich, Switzerland., Vance D; Institute of Geochemistry and Petrology, Department of Earth Sciences, ETH Zurich, Clausiusstrasse 25, 8092, Zurich, Switzerland., de Campos MDR; Institute of Geosciences, University of São Paulo (USP), São Paulo, SP, Brazil., Babinski M; Institute of Geosciences, University of São Paulo (USP), São Paulo, SP, Brazil., Pereira LG; Institute of Geosciences, University of São Paulo (USP), São Paulo, SP, Brazil., Leme JM; Institute of Geosciences, University of São Paulo (USP), São Paulo, SP, Brazil., Boggiani PC; Institute of Geosciences, University of São Paulo (USP), São Paulo, SP, Brazil., Osés GL; Programa de Pós-Doutorado, Instituto de Física, Universidade de São Paulo (USP), Rua do Matão, 1371, São Paulo, 05508090, Brazil.; Laboratório de Arqueometria e Ciências Aplicadas ao Patrimônio Cultural, Instituto de Física, Universidade de São Paulo (USP), Rua do Matão, 1371, São Paulo, 05508090, Brazil., Rudnitzki ID; Departament of Geology, Federal University of Ouro Preto (UFOP), Ouro Preto, MG, Brazil., Galante D; Institute of Geosciences, University of São Paulo (USP), São Paulo, SP, Brazil.; Laboratório Nacional de Luz Síncrotron, Campinas, SP, Brazil., Rodrigues F; Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo (USP), São Paulo, SP, Brazil., Trindade RIF; Department of Geophysics, Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo (USP), São Paulo, SP, Brazil.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2024 Jun 28; Vol. 14 (1), pp. 14916. Date of Electronic Publication: 2024 Jun 28.
DOI: 10.1038/s41598-024-65671-4
Abstrakt: The Ediacaran-Cambrian transition documents a critical stage in the diversification of animals. The global fossil record documents the appearance of cloudinomorphs and other shelled tubular organisms followed by non-biomineralized small carbonaceous fossils and by the highly diversified small shelly fossils between ~ 550 and 530 Ma. Here, we report diverse microfossils in thin sections and hand samples from the Ediacaran Bocaina Formation, Brazil, separated into five descriptive categories: elongate solid structures (ES); elongate filled structures (EF); two types of equidimensional structures (EQ 1 and 2) and elongate hollow structures with coiled ends (CE). These specimens, interpreted as diversified candidate metazoans, predate the latest Ediacaran biomineralized index macrofossils of the Cloudina-Corumbella-Namacalathus biozone in the overlying Tamengo Formation. Our new carbonate U-Pb ages for the Bocaina Formation, position this novel fossil record at 571 ± 9 Ma (weighted mean age). Thus, our data point to diversification of metazoans, including biomineralized specimens reminiscent of sections of cloudinids, protoconodonts, anabaritids, and hyolithids, in addition to organo-phosphatic surficial coverings of animals, demonstrably earlier than the record of the earliest known skeletonized metazoan fossils.
(© 2024. The Author(s).)
Databáze: MEDLINE
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