Análisis paleontológicos a través límite Ediacárico-Cámbrico, Grupo Alto Corumbá, Brasil
| Autor: | Matheus Denezine, Lucas Veríssimo Warren, Gerard J.B. Germs, G. Fazio, M.E.A.F. Ramos, Edi Mendes Guimarães, Martino Giorgioni, D. A. do Carmo, M.C. Baptista, Thais C. Tobias, Ivan Cortijo, Yaoping Cai, Milene F. Figueiredo, B.D. Erdtmann, Evelyn Aparecida Mecenero Sanchez, Detlef H.G. Walde, Rodrigo Rodrigues Adôrno |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Extinction event
QE1-996.5 010504 meteorology & atmospheric sciences Fauna Species diversity Biozone bioestratigrafía Geology 010502 geochemistry & geophysics 01 natural sciences micropaleontología grupo de corumbá Gemmule (pangenesis) Paleontology Sponge spicule Group (stratigraphy) Taxonomy (biology) 0105 earth and related environmental sciences ediacárico-cámbrico |
| Zdroj: | Estudios Geologicos, Vol 75, Iss 2, Pp e094-e094 (2019) |
| ISSN: | 1988-3250 0367-0449 |
| Popis: | This work presents the results of a palaeontological analysis focused on twenty-six species sampled in five sections of the Tamengo and Guaicurus formations, Corumba and Ladario regions: Corcal and Laginha quarries, Porto Sobramil, Porto Figueiras and Ecoparque Cacimba. Besides, palaeoecological and palaeoenvironmental inferences are presented based on the occurrence of this fossil assemblage. Cloudina carinata Cortijo et al., 2010, previously documented in Spain and Siberia, presents an unprecedented occurrence in the American continent, in siltstones of the Tamengo Formation at Porto Figueiras section, Municipality of Corumba, Mato Grosso do Sul State, Brazil. The biota of the Tamengo Formation is updated and composed of three biomineralizing metazoans, including poriferan spicules, putative sponge gemmule, and a sessile epibiontic prokaryotic colony. The present work also deals with the taxonomy and stratigraphic distribution of four ichnospecies and three vendotaenid species that integrate the updated benthic fauna for the upper portion of Corumba Group. The species diversity of the Tamengo Formation was complemented by the occurrence of sixteen microfossil species that possibly represent a marine planktic assemblage. A dramatic change was identified in the palaeoenvironmental conditions of the Tamengo to Guaicurus formations, followed by a mass extinction event, possibly linked to the global Ediacaran- Cambrian mass extinction. In addition, organic-walled microfossils were prepared and analyzed from sections of three countries: nine species from the Nomtsas Formation, Namibia; four species from the Tagatiya Guazu Formation, Paraguay; and six species from the Dengying Formation, China. An international biostratigraphic essay consisting of six biozones is proposed for the uppermost Ediacaran and one biozone for the earliest Cambrian. |
| Databáze: | OpenAIRE |
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