Where: Montana (44.7° N, 112.8° W: paleocoordinates 14.3° N, 35.1° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Thaynes Formation, Olenekian (251.2 - 247.2 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified limestone

Size class: macrofossils

Preservation: replaced with silica

Reposited in the AMNH

Primary reference: N. D. Newell and D.W. Boyd. 1995. Pectinoid bivalves of the Permian-Triassic crisis. Bulletin of the American Museum of Natural History 227:1-95 [D. Bottjer/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 44303: authorized by David Bottjer, entered by Catherine Powers on 08.09.2004

Creative Commons license: CC BY (attribution)