This image shows an insect fossil (some sort of fly?) found in the Florissant Formation of Teller County, Colorado, USA. It dates to the Eocene Epoch (56-33.9 million years ago) of the Paleogene Period. Thanks to Kenny for the microscope image. Field of view on image is 5 mm.
He has been working on stitching images together of the same fossil thus allow higher detailed images. Older image below:
See previous images of fossil fly here:
https://louisvillefossils.blogspot.com/2019/01/fly-fossil.html