Road PR-239, km 44.6: Wordian - Capitanian, Brazil
collected by R. Rohn

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Bivalvia - Pholadomyida - Pachydomidae
Cowperesia emerita (Reed 1929)
Bivalvia - Pholadomyida - Megadesmidae
Bivalvia - Grammysiidae
Leinzia curta Beurlen 1954
Bivalvia - Carditida - Astartidae
Terraia bipleura (Reed 1929)
Terraia curvata (Reed 1929)
see common names

Geography
Country:Brazil State/province:Paraná
Coordinates: 24.7° South, 51.0° West (view map)
Paleocoordinates:35.9° South, 19.6° West (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Permian Epoch: Guadalupian
Stage: Wordian - Capitanian 10 m.y. bin: Permian 4
Key time interval: Wordian - Capitanian
Age range of interval: 266.9 - 259.51 m.y. ago
Stratigraphy
Formation:Rio do Rasto Member:Serrinha
Stratigraphic resolution:group of beds
Stratigraphy comments: According to current knowledge, the vertical range of four studied species (T. curvata, A. prosoclina, L. curta, and B. elongatella) is restricted to the basal part of the Serrinha Member. Despite the high degree of endemism, the studied bivalve assemblage can be correlated with that of the Permian Gai-As Formation (David et al., 2011) in the Huab region of Namibia, which shares in common at least two species (T. curvata and C. emerita). Radiometric dating of zircon grains from tuff beds between two bivalve horizons within the upper part of the Gai-As Formation provide U/PB ages of 265 ± 2.5 Ma (Holzforster, 2000, 2002; Wanke, 2000).
Lithology and environment
Primary lithology:gray,green lithified "siliciclastic"
Lithology description: Greenish-gray heterolithic facies
Environment:lacustrine - large
Taphonomy
Modes of preservation:mold/impression
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:taxonomic analysis
Collectors:R. Rohn
Collection method comments: Repository: Institute of Geosciences and Exact Sciences of Sao Paulo State University (UNESP) in Rio Claro, Sao Paulo State, under the code URC-MB
Metadata
Database number:209026
Authorizer:M. Clapham Enterer:M. Clapham
Research group:marine invertebrate
Created:2020-04-23 21:52:35 Last modified:2025-02-22 15:12:02
Access level:the public Released:2020-04-23 21:52:35
Creative Commons license:CC0
Reference information

Primary reference:
72170. M. G. Simões, S. A. Matos, L. E. Anelli, R. Rohn, L. V. Warren and J. M. David. 2015. A new Permian bivalve-dominated assemblage in the Rio do Rasto Formation, Parana Basin, Brazil: Faunal turnover driven by regional-scale environmental changes in a vast epeiric sea. Journal of South American Earth Sciences 64:14-26 [M. Clapham/M. Clapham]