Fossilized Plecia Fly
Fossilized Plecia Fly insects are extremely rare to find. The Plecia fly is found in the green river formation of Wyoming, USA and range from 40-50 million years old. As the insect contains no hard shell, the insect must fall into water and be covered with sediment to fossilize. Thus, there are very few insect specimens as a bizarre set of coincidences must occur in order for the insect to fossilize.
This fossil requires special care - exposure to water and other chemicals, such as cleaning products or aerosols, will damage it over time. If you polish the stone, use a dry cloth only, or an air duster that does not contain any disinfectant or other chemicals.