Mahaffey Trail, locality 41087 (Eocene of the United States)

Where: Colorado (39.5° N, 108.1° W: paleocoordinates 43.3° N, 94.6° 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 lime mudstone

• Laramide-style block faulting

Size class: macrofossils

Preservation: adpression

Collected by D. Kohls in 1995; reposited in the USNM

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 138691: authorized by Matthew Clapham, entered by Matthew Clapham on 25.01.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

 Blattodea - Ectobiidae
Ectobius kohlsi2 Vrsansky et al. 2014 cockroach
USNM 41087/105061
 Orthoptera - Gryllidae
? Eogryllus elongatus1 Gorochov 2012 field cricket
USNM Kohls 105080-AB
 Hymenoptera - Formicidae
Eoformica pinguis Scudder 1877 ant
USNM 495887, 888