Where: Wyoming (41.2° N, 110.3° W: paleocoordinates 45.2° N, 96.6° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Bridger Formation, Bridgerian (50.3 - 46.2 Ma)

• Found in surface material weathered from the lower strata of the fresh-water Bridger formation of upper Eocene age.

• bed-level stratigraphic resolution

Environment/lithology: lacustrine - large; lithified, diatomaceous mudstone

Size class: macrofossils

Preservation: mold/impression

Collected by G.B. Pierce in 1930; reposited in the USNM

Collection methods: surface (float)

• Collected by 1930 Smithsonian expedition led by C.W. Gilmore.

Primary reference: R. W. Brown. 1934. Celliforma spirifer, the fossil larval chambers of mining bees. Journal of the Washington Academy of Sciences 24:532-539 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 127634: authorized by Matthew Clapham, entered by Amy Delelli on 19.05.2012

Creative Commons license: CC BY (attribution)