Insects are somewhat commonly preserved in the shale layers of the Florissant formation. Below are some fine examples that I found over twenty years ago.
A Robber fly (?)
Some kind of wasp or flying ant (both sides)
A moth with some wing patterning preserved
The Florissant formation is the remains of a temporary lake that is
dated to the Eocene period (Priabonian stage) and is located in
Colorado.
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