0.5 Detailed Fossil March Fly Insect Green River FM Uintah County UT Eocene Age
Location: Uintah County, Utah
Weight: 1.3 Ounces
Dimensions: 2.1 Inches Long, 2.1 Inches Wide, 0.3 Inches Thick (Plate)
Insect Dimensions: 0.5 Inches Long, 0.4 Inches Wide
The item pictured is the one you will receive.
50 million years old, Eocene age
March Fly Insect
This exquisite March fly specimen originates from the Green River Formation in Uintah County, Utah, dating to the Eocene epoch approximately 50 million years ago. During this period, Fossil Lake—a vast freshwater system spanning nearly 930 square miles—covered the region. The lake's distinctive geochemistry created ideal preservation conditions, preventing decomposition and allowing organisms to be entombed in alternating layers of fine limestone. This particular insect represents the diverse aquatic and terrestrial fauna that thrived in this ancient ecosystem, alongside perfectly preserved fish, plants, crustaceans, amphibians, reptiles, and early mammals. The Green River Formation's laminated sediments have yielded the world's most concentrated assemblage of Paleogene freshwater fossils, making specimens like this invaluable records of a complete ecosystem from Earth's deep past. Each fossil captures a moment frozen in time, offering paleontologists and collectors a window into life during the early Cenozoic Era.
