Where: Paraná, Brazil (24.7° S, 51.0° W: paleocoordinates 42.3° S, 23.2° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Serrinha Member (Rio do Rasto Formation), Wordian to Wordian (266.9 - 259.5 Ma)

• 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).

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine - large; lithified, gray, green siliciclastic sediments

Size class: macrofossils

Preservation: mold/impression

Collected by R. Rohn

• Repository: Institute of Geosciences and Exact Sciences of Sao Paulo State University (UNESP) in Rio Claro, Sao Paulo State, under the code URC-MB

Primary reference: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 209026: authorized by Matthew Clapham, entered by Matthew Clapham on 23.04.2020

Creative Commons license: CC BY (attribution)