Cloudina-Corumbella-Namacalathus association from the Itapucumi Group, Paraguay: Increasing ecosystem complexity and tiering at the end of the Ediacaran

Autor(es)

Warren, Lucas Verissimo ; Quaglio, Fernanda ; Simoes, Marcello Guimaraes ; Gaucher, Claudio ; Riccomini, Claudio ; Poire, Daniel G. ; Freitas, Bernardo Tavares ; Boggiani, Paulo C. ; Sial, Alcides Nobrega

• Tipo de documento: Artigo Científico
• Fonte: Precambrian Research; v. 298, p. 79-87, SEP 2017.
• Citações Web of Science: 15

Resumo

The intriguing Ediacaran fossil Namacalathus is described from limestones of the Tagatiya Guazu Formation, Itapucumi Group, Paraguay. This is the fifth occurrence of the genus in the Ediacaran geological record. The Paraguayan Namacalathus specimens are preserved as partially complete spheroidal cups with an opening at the top and thin walled stems. The remains of this soft-calcified globe-shaped organism occur as sparse disarticulated parautochthonous fragments within bioclastic deposits dominated by Cloudina shells with subordinate Corumbella fragments. The co-occurrence of these three skeletal metazoan species in the same environmental context attests that the diversity of the Paraguayan accumulations is ecologically comparable to the typical skeletal assemblage of the Nama Group. The discovery of new samples of Namacalathus in the Itapucumi Group also indicates that this genus presented a broader paleobiogeographic distribution than previously thought and, in the same way as Cloudina, it represents a low latitude, shallow water metazoan of the Ediacaran Gondwana. (C) 2017 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 10/02677-0 - Isótopos estáveis (C, O e Sr) do Grupo Itapucumi e correlações com o Grupo Corumbá (Ediacarano)
• Beneficiário: Paulo César Boggiani
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 10/19584-4 - Tectônica e sedimentação do grupo Itapucumi no contexto das plataformas carbonáticas ediacaranas: abordagem geoquímica, geocronológica, paleomagnética e bioestratigráfica
• Beneficiário: Lucas Verissimo Warren
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/24608-3 - Análise multi-proxy da formação Cerro Negro, Argentina: bioestratigrafia e paleoambiente do primeiro fossillagerstätte Ediacarano da América do Sul
• Beneficiário: Lucas Verissimo Warren
• Modalidade de apoio: Auxílio à Pesquisa - Regular