Where: Wyoming (42.8° N, 108.7° W: paleocoordinates 14.6° N, 30.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Franson Member (Park City Formation), Wordian (268.0 - 265.0 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: lithified limestone

Size class: macrofossils

Preservation: replaced with silica

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 115794: authorized by Matthew Clapham, entered by Matthew Clapham on 03.09.2011

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)