Disbrow Creek, site 10, locality 41621 (Eocene of the United States)

Where: Montana (48.4° N, 113.7° W: paleocoordinates 51.9° N, 100.3° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Coal Creek Member (Kishenehn Formation), Lutetian (47.8 - 41.3 Ma)

• Middle sequence of the Coal Creek member of the Kishenehn Formation, which has been estimated to be 46.2 +/- 0.4 myo (Lutetian) by 40Ar/39Ar analysis and 43.5 +/- 4.9 myo by fission-track analysis

• group of beds-level stratigraphic resolution

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

• Paper/oil shale

Size classes: macrofossils, mesofossils

Preservation: adpression

Collected by N. Constenius in 1998; reposited in the USNM

Collection methods: mechanical

Primary reference: G. M. Dlussky and A. P. Rasnitsyn. 2002. Ants (Hymenoptera: Formicidae) of Formation Green River and some other middle Eocene deposits of North America. Russian Entomological Journal 11:411-436 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 138693: authorized by Matthew Clapham, entered by Matthew Clapham on 25.01.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

 Hymenoptera - Formicidae
Eoformica pinguis Scudder 1877 ant
USNM 495993, 994