An intrepid fossil hunter on the U.S. Forest Service’s Flathead National Forest in northwest Montana doesn’t need to dig too deep to find exquisitely preserved fossil insects with traces of their original stomach contents. Amazing as this sounds you just need to visit rock outcrops of the Kishenehn Formation exposed on the banks of the Flathead River.
There, researchers affiliated with the Smithsonian’s National Museum of Natural History have discovered a treasure trove of tiny, 46-million year old fossil insects from the Eocene Epoch, which were deposited in sediments of an ancient lake early during the Age of Mammals. The preserved insects—over 7,000 specimens have been collected over the last several years—include fossil mosquitos. At least one specimen preserves an abdomen still engorged from its last meal.