Where: Montana (44.9° N, 111.8° W: paleocoordinates 18.0° N, 31.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Shedhorn Formation, Capitanian (265.0 - 259.0 Ma)

• Upper Shedhorn Formation

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; lithified sandstone

Size class: macrofossils

Primary reference: K.W. Ciriacks. 1963. Permian and Eotriassic bivalves of the middle Rockies. Bulletin of the American Museum of Natural History 125(1):1-100 [M. Clapham/M. Clapham] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 81427: authorized by Matthew Clapham, entered by Matthew Clapham on 22.06.2008

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