Where: Namibia (20.8° S, 14.1° E: paleocoordinates 48.3° S, 22.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• In this unit, just above the last occurrences of bivalves, there are volcanic tufs, 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).

• group of beds-level stratigraphic resolution

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

Size class: macrofossils

Preservation: mold/impression, replaced with silica

Primary reference: J. M. David, M. G. Simões, L. E. Anelli, R. Rohn, and F. Holzfoerster. 2011. Permian bivalves from the Gai-As Formation, northern Namibia: systematics, taphonomy, and biostratigraphy. Alcheringa 35:497-516 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 101185: authorized by Matthew Clapham, entered by Matthew Clapham on 18.12.2010

Creative Commons license: CC BY (attribution)