Where: Park County, Colorado (39.1° N, 105.7° W: paleocoordinates 40.4° N, 98.0° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Antero Formation, Orellan (33.9 - 33.3 Ma)

• Formation around 300 ka younger than Florissant.

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine - large; lithified shale

Size classes: macrofossils, mesofossils

Preservation: mold/impression, adpression

Collected by C. Durden; reposited in the YPM

Primary reference: C. J. Durden. 1966. Oligocene lake deposits in central Colorado and a new fossil insect locality. Journal of Paleontology 40:215-219 [M. Clapham/M. Clapham]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 149289: authorized by Matthew Clapham, entered by Jered Karr on 31.07.2013, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)