Where: Rio Grande do Sul, Brazil (30.1° S, 54.3° W: paleocoordinates 46.4° S, 29.0° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Teresina Formation, Wordian to Wordian (266.9 - 259.5 Ma)

• Despite the absence of deposits the Serrinha Member, basal part of Rio do Rasto Formation, in the geological map of the Tiaraju region, the bivalve fauna suggests a correlation to those of the basal part of the Serrinha interval of the Passa Dois Group. Yet, in the Permian deposits of the Gai‑As Formation, where Cowperesia emerita and Terraia altissima are common, radiometric dating of zircon grains from tuff beds found in the bivalve‑bearing succession provided U/Pb ages of 265 ± 2.5 Ma (Wanke 2000; Holzförster 2002). Therefore, a Wordian‑Capitanian age is indicated to the bivalve fauna.

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine - large; lithified, concretionary siltstone

Size class: macrofossils

Preservation: mold/impression

Collection methods: Repository: Museum of Paleontology, Vale do Rio dos Sinos University (UNISINOS), State of Rio Grande do Sul, southern Brazil

Primary reference: M. G. Simões, J. M. David, L. E. Anelli, C. Klein, S. A. Matos, V. B. Guerrini, and L. V. Warren. 2017. The Permian Tiaraju bivalve assemblage, Passa Dois Group, southern Brazil: biostratigraphic and paleobiogeographic significance. Brazilian Journal of Geology 47:209-224 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 209025: authorized by Matthew Clapham, entered by Matthew Clapham on 23.04.2020

Creative Commons license: CC BY (attribution)