Where: Colorado (39.5° N, 108.5° W: paleocoordinates 43.3° N, 95.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Green River Formation, Bridgerian (50.3 - 46.2 Ma)

• group of beds-level stratigraphic resolution

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

Size class: macrofossils

Preservation: adpression

Collected by Henderson, Byram in 1923; reposited in the UCM

Primary reference: M. T. James. 1932. A new Eocene syrphid from Colorado (Diptera). The Canadian Entomologist 64:264 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 152078: authorized by Matthew Clapham, entered by Matthew Clapham on 05.11.2013

Creative Commons license: CC BY (attribution)