Paraná Basin, USP collection: Capitanian - Wuchiapingian, Brazil

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Pholadomyida - Megadesmidae
(2 measurements)
see common names

Geography
Country:Brazil
Coordinates: 26.2° South, 51.0° West (view map)
Paleocoordinates:34.9° South, 17.2° West (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:basin
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:Serrinha
Stratigraphic resolution:group of beds
Stratigraphy comments: The type of preservation and lithology of the internal molds seem to be similar to that of bivalve-rich horizons found in the basal portion of Serrinha 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:gray lithified mudstone
Environment:lacustrine - large
Taphonomy
Modes of preservation:body,mold/impression,replaced with silica
Size of fossils:macrofossils
Collection methods and comments
Collection methods:survey of museum collection
Reason for describing collection:taxonomic analysis
Collection method comments: Repository: Scientific Collection of the Institute of Geosciences, University of São Paulo, São Paulo
Metadata
Database number:132148
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:M. Clapham Research group:freshwater
Created:2012-08-08 15:18:17 Last modified:2025-02-22 15:12:02
Access level:the public Released:2012-08-08 15:18:17
Creative Commons license:CC0
Reference information

Primary reference:
42575. L. E. Anelli, M. G. Simões, and J. M. David. 2010. A new Permian bivalve (Megadesmidae, Plesiocyprellinae) from the Serrinha Member, Rio do Rasto Formation, Paraná basin, Brazil. Revista do Instituto de Geociências - USP 10(2):13-21 [M. Clapham/M. Clapham/M. Clapham]