Where: Shasta County, California (40.7° N, 122.0° W: paleocoordinates 41.6° N, 108.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Montgomery Creek Formation, Bartonian (41.3 - 38.0 Ma)

• Likely from near top of upper member. Plants suggest late Middle Eocene age.

• group of beds-level stratigraphic resolution

Environment/lithology: mire or swamp; lithified shale

Size classes: macrofossils, mesofossils

Preservation: mold/impression

Collected by Ralph W. Chancy; reposited in the UCMP

Primary reference: T. D. A. Cockerell. 1930. A Fossil Dragon-fly from California (Odonata: Calopterygidae). Entomological News 41:49-50 [M. Clapham/A. Aguilar/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 117537: authorized by Matthew Clapham, entered by Alex Aguilar on 23.09.2011

Creative Commons license: CC BY (attribution)