Fossil Herring – collected from Wyoming
About 50-40 million years ago this now extinct fossil fish, Knightia eocaena, was the most common fish found in the freshwater lakes of what is now Colorado, Utah, and Wyoming. They were once an abundant and important food source, but now are the most commonly excavated fossil fish in the world. Vast oil shale deposits in the Green River Formation exceptionally preserved these fossils, and because of their abundance, Knightia eocaena is Wyoming’s state fossil.
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