Eocene Green River Formation Fossil Robber Fly

Insect Order Diptera, Family Asilidae

Geological Time: Eocene

Size (25.4 mm = 1 inch): Insect fossil is 12 mm, Matrix: 70 mm by 65 mm

Fossil Site: Green River Shale, Uintah County, Utah

Fossil Code: GRF205

Price: Sold

Description: The Green River Formation deposits of Wyoming, Colorado, and Utah are best known for their immaculately-preserved fish, but other examples are known as well, as this specimen attests. This is an example of a robber fly, an uncommon Green River fossil. The robber flies derive their name from their predatory behavior, pursuing and capturing insects in flight.

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