Denson site 4, locality 41142 (Eocene of the United States)

Where: Colorado (39.5° N, 108.0° W: paleocoordinates 43.3° N, 94.5° 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 1998; reposited in the USNM

Primary reference: P. Vrsansky, L. Vidlicka, F. Ciampor and F. Marsh. 2012. Derived, still living cockroach genus Cariblattoides (Blattida: Blattellidae) from the Eocene sediments of Green River in Colorado, USA. Insect Science 19:143-152 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 138809: authorized by Matthew Clapham, entered by Matthew Clapham on 28.01.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Blattodea - Ectobiidae
Cariblattoides labandeirai Vrsansky et al. 2012 cockroach
USNM 542293, 294
Ectobius kohlsi2 Vrsansky et al. 2014 cockroach
USNM 41142/55491, 57239, 57656, 58123
 Orthoptera - Eumastacidae
Eoerianthus eocaenicus1 Gorochov 2012 monkey grasshopper
USNM Kohls 55307
 Orthoptera - Tetrigidae
Eotetrix unicornis1 Gorochov 2012 pygmy grasshopper
USNM Kohls 57885, 55646
 Orthoptera - Gryllidae
? Nemobiinae indet.1 Chopard 1922 true crickets
USNM Kohls 57057
? Pentacentrinae indet.1 Saussure 1878 true crickets
USNM Kohls 55166
? Eneopterinae indet.1 Kirby 1906 bush cricket
USNM Kohls 57226, 55273-AB
Gryllinae indet.1 Laicharting 1781 field cricket
USNM Kohls 56180/56190, 57562
Pronemobius sp.1 Scudder 1890 field cricket
USNM Kohls 56345-AB
Pronemobius ? tertiarius1 Scudder 1878 field cricket
USNM Kohls 55178-AB, 58141-AB
Eogryllus unicolor1 Gorochov 2012 field cricket
USNM Kohls 57653, 55248-AB, 57394, 57246
 Orthoptera - Mogoplistidae
Pteromogoplistes sp.1 Gorochov 2012 scaly cricket
USNM Kohls 57348-AB, 55394
Pteromogoplistes ? smithii1 Scudder 1890 scaly cricket
USNM Kohls 57647, 58079, 56129-AB, 55365