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The first record of Hirnantian Ostracoda in South America: implications for the biostratigraphy and paleozoogeography of the Paraná basin

Published online by Cambridge University Press:  22 September 2021

Lívio Reily de Oliveira Gonçalves ,
Dermeval Aparecido Do Carmo Open the ORCID record for Dermeval Aparecido Do Carmo [Opens in a new window] ,
Maria José Salas ,
Rodrigo Rodrigues Adôrno Open the ORCID record for Rodrigo Rodrigues Adôrno [Opens in a new window] ,
Tõnu Meidla ,
Matheus Denezine ,
Lívia Cardoso da Silva Rodrigues ,
Mario Luis Assine  and
Lucas Silveira Antonietto
Lívio Reily de Oliveira Gonçalves
Affiliation:
Institute of Geosciences, University of Brasília, Brasília, Brazil70910-900 , , , ,
Dermeval Aparecido Do Carmo*
Affiliation:
Institute of Geosciences, University of Brasília, Brasília, Brazil70910-900 , , , ,
Maria José Salas
Affiliation:
Center for Research in Earth Sciences, National Scientific and Technical Research Council, Córdoba, ArgentinaX5016GCA
Rodrigo Rodrigues Adôrno
Affiliation:
Institute of Geosciences, University of Brasília, Brasília, Brazil70910-900 , , , , Geological Survey of Brazil, Center for Technological Development, Brasília, Brazil, 70040-904
Tõnu Meidla
Affiliation:
Department of Geology, University of Tartu, Tartu, Estonia50411
Matheus Denezine
Affiliation:
Institute of Geosciences, University of Brasília, Brasília, Brazil70910-900 , , , ,
Lívia Cardoso da Silva Rodrigues
Affiliation:
Institute of Geosciences, University of Brasília, Brasília, Brazil70910-900 , , , ,
Mario Luis Assine
Affiliation:
Department of Geology, São Paulo State University, Rio Claro, Brazil13506-752
Lucas Silveira Antonietto
Affiliation:
Institute of Geosciences, University of Brasília, Brasília, Brazil70910-900 , , , ,
*
*Corresponding author
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Abstract

Herein is reported the first occurrence of ostracodes from the Iapó Formation, an uppermost Ordovician unit of the Rio Ivaí Group in the Paraná basin, Brazil. Two ostracode species were identified in the Três Barras Farm section: Harpabollia harparum (Troedsson, 1918) and Satiellina paranaensis Adôrno and Salas in Adôrno et al., 2016 were recovered from dropstone-bearing shale overlying glaciogenic diamictites, a feature typical of Hirnantian (uppermost Ordovician) strata throughout Gondwana. The taxonomy of the Genus Harpabollia, as well as its type species Harpabollia harparum, was reviewed, and emended and new diagnoses were respectively proposed for each taxon. Occurrences of Harpabollia harparum and Satiellina species were common in areas influenced by cold waters. Additionally, the occurrence of Harpabollia harparum, an index species to the uppermost Ordovician of several stratigraphic units in Baltica and southern Gondwana, allowed us to infer a Hirnantian age for the deposits of the Iapó Formation. Other than being associated with Harpabollia harparum in Iapó Formation of the Paraná basin, Satiellina paranaensis is also found in lower levels of the Vila Maria Formation; therefore, these are also considered Hirnantian in age. Above these lower levels of the Vila Maria Formation, a well-dated Rhuddanian (lowermost Llandovery, Silurian) palynomorph assemblage is observed within the formation. These occurrences are evidence of a continuous process of sedimentary deposition during the Ordovician–Silurian transition in the Paraná basin.

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Journal of Paleontology , Volume 96 , Issue 2 , March 2022 , pp. 323 - 333
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Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Paleontological Society

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