Ancient Earth Trading Co. - (866) 327-8401

RARE Pronemomobius smithii Cricket Fossil from Hawes Quarry Colorado

More Views

RARE Pronemomobius smithii Cricket Fossil from Hawes Quarry Colorado

Availability: In stock

Pronemobius smithii (Cricket)

Age : Eocene (48 Ma)
Formation : Parachute Creek Member / Green River Formation
Locality : Hawes Quarry, Rio Blanco, Colorado

Cricket : 4.7 x 1 cm

Pronemobius had a body that was somewhat flattened and had long antennae. Since the Eocene period was one of the hottest times in the earth's history, Pronemobius would most likely have been able to lay its eggs quite often. The area of the Green River Formation (Wyoming, Colorado, and Utah) was very warm in the Eocene. Palm trees grew there and the environment was quite tropical.

In a detailed study, researchers at the University of Colorado scoured more than 500 museum drawers of Green River fossils for crickets and katydids with intact from legs, looking for evidence of ears. Their analysis indicated that these insects had developed extremely sensitive ultrasonic hearing by at least 50 million years ago. The researchers determined that crickets, moths, and other flying insects have ultrasound-sensitive hearing and can hear bats coming, diving, or swerving in mid-flight to avoid being eaten. Crickets and katydids have ears on their front legs, just below their knees. Insects that evolved such super-sensitive hearing would have had a crucial survival advantage, the researchers said. It is thought that the big evolutionary trigger for the appearance of hearing in many insects is the appearance of bats. Prior to the evolution of bats we would expect to find ears in relatively few insects.


The Green River Formation is famous worldwide for its fossil fish and other associated fauna (reptiles, birds, mammals, & plants). The Green River Fm. also provides us a rare snapshot glimpse into life 49 million years ago.

The preservation of the fossil insects in the Hawes Quarry are just spectacular, some good enough to allow not only identification to family and subfamily, but will sometimes show color patterns, wing venation, and sex-related characters.

This fossil specimen was collected by William Hawes, from his quarry, the Hawes Quarry, in Rio Blanco County, Colorado. The Hawes Quarry has produced some of the most amazingly beautiful insect fossils from the Green River Fm. and these represent the hand selected, choice picks, from Hawes years of collecting in the mountains of Colorado.

Specimen will come with an identification card.

Scientific Classification :
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Orthoptera
Suborder: Ensifera
Superfamily: Grylloidea
Family: Gryllidae
Genus: Pronemobius
Species: smithii