Where: Mato Grosso, Brazil (17.2° S, 53.3° W: paleocoordinates 34.3° S, 22.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Corumbataí Formation, Wordian to Wordian (266.9 - 254.2 Ma)

• Estrada Nova Formation = Corumbataí Formation. Corumbataí Fm is equivalent of the Serra Alta and Teresina Formations, and contains bivalves assigned to pre-Rio do Rasto zones in the Paraná Basin bivalve biochronology. This collection assigned to the Pinzonella illusa bivalve assemblage, which is also found in the lower Teresina Formation. The Teresina Fm yielded a radiometric date of 267 +/- 17 Ma, with the overlying Serrinha Mb (Rio do Rasto Fm) yielding an age or 266.3 +/- 4.6 Ma (Rocha-Campos et al., 2019). Bivalves correlated to the lower Serrinha Member were associated with U/Pb ages of 265 +/- 2.5 Ma in Namibia (David et al., 2011). This suggests a Wordian or earlier age for the Corumbataí Fm. However, the lower part of the Corumbataí Fm itself yielded an ID-TIMS age of 257.5 +/- 2.2 Ma (Rocha-Campos et al., 2019), which would suggest the Corumbataí is actually Wuchiapingian.

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine; lithified, shelly/skeletal sandstone

Size class: macrofossils

Preservation: replaced with silica

Collected by Almeida, Caster, Barbosa, Petri in 1947

• Repository: Institute of Geosciences, University of São Paulo

Primary reference: J. C. Mendes. 1963. Lamelibrânquios permianos do Estado do Mato Grosso (Formação Estrada Nova). Boletim da Sociedade Brasileira de Geologia 12:57-64 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 209028: authorized by Matthew Clapham, entered by Matthew Clapham on 23.04.2020

Creative Commons license: CC BY (attribution)