Outcrop 3, Paulo Frontin: Capitanian - Wuchiapingian, Brazil

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Pholadomyida - Pachydomidae
Bivalvia - Actinodontida - Palaeomutelidae
see common names

Geography
Country:Brazil State/province:Paraná
Coordinates: 26.0° South, 50.8° West (view map)
Paleocoordinates:34.7° South, 17.0° West (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Permian Epoch: Guadalupian - Lopingian
Stage: Capitanian - Wuchiapingian 10 m.y. bin: Permian 4
Key time interval: Capitanian - Wuchiapingian
Age range of interval: 264.28 - 254.14 m.y. ago
Stratigraphy
Formation:Rio do Rasto Member:Morro Pelado
Stratigraphic resolution:group of beds
Stratigraphy comments: Lower Morro Pelado Member. In the basal interval of the Rio do Rasto Formation, the Terraia curvata assemblage correlates with those of the Gai-As Formation, in the Huab Basin, Namibia, Africa (David et al. 2011; Simões et al. 2015). In this unit, just above the last occurrences of bivalves, there are volcanic tuffs, and radiometric dating of zircon minerals from them yields ages of 265+2.5 Ma, nearly at the Wordian–Capitanian limit, Guadalupian Epoch (Stollhofen et al. 2000). Therefore, the studied assemblages containing Palaeomutela and other endemic bivalves of the Paraná Basin, which are stratigraphically above bivalves of the Terraia curvata assemblage, are probably Capitanian–Wuchiapingian in age. This assumption is in good accord with very recent U–Pb zircon ages acquired using a sensitive high-resolution ion microprobe and an isotope dissolution thermal ionization mass spectrometer (see Rocha Campos et al. 2019) from tuffs, which suggest that the studied interval of the Rio do Rasto Formation was deposited between the Capitanian and Wuchiapingian stages.
Lithology and environment
Primary lithology: lithified "siliciclastic"
Environment:lacustrine - large
Taphonomy
Modes of preservation:mold/impression
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collection method comments: Repository: IBB/UNESP, Botucatu Campus (coded as DZP, Department of Zoology-Paleontology, São Paulo State University, Botucatu Campus, São Paulo, Brazil); IGc/USP (coded as GP/1T, Invertebrate Type Collection of Institute of Geosciences, University of São Paulo, São Paulo, Brazil); and IGCE/UNESP, Rio Claro campus (coded as URC MB, Institute of Geosciences and Exact Sciences, São Paulo State University, Rio Claro Campus, São Paulo, Brazil).
Metadata
Database number:209024
Authorizer:M. Clapham Enterer:M. Clapham
Research group:freshwater
Created:2020-04-23 20:20:25 Last modified:2025-02-22 15:12:02
Access level:the public Released:2020-04-23 20:20:25
Creative Commons license:CC0
Reference information

Primary reference:
72164. V. B. Guerrini, S. A. Matos, R. Rohn, F. G. Varejão, L. V. Warren and M. G. Simões. 2020. The last chapter of 30 million years of molluscan evolution: Permian non-marine bivalves of the Rio do Rasto Formation, Paraná Basin, Brazil. PalZ 94:487-512 [M. Clapham/M. Clapham/M. Clapham]