Where: Utah (40.5° N, 111.6° W: paleocoordinates 10.1° N, 36.3° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Thaynes Formation, Smithian (251.3 - 247.2 Ma)

• Upper Thaynes (Owenitan)

• bed-level stratigraphic resolution

Environment/lithology: lithified limestone

Size class: macrofossils

Preservation: replaced with silica

Reposited in the AMNH

Primary reference: N. D. Newell and D.W. Boyd. 1975. Parallel evolution in early trigonacean bivalves. Bulletin of the American Museum of Natural History 154(2):55-162 [D. Bottjer/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 94891: authorized by Matthew Clapham, entered by Matthew Clapham on 31.03.2010

Creative Commons license: CC BY (attribution)