Fossilized Fish (Diplomystus dentatus)Species: Diplomystus dentatus Age: Eocene (approx. 50 million years ago) Source: Green River Formation, Kemmerer, WY Size: 6. 25" x 4. 6" Diplomystus dentatus is an extinct genus of freshwater fish belonging to the same family as herrings and sardines, found in the Green River formation in Wyoming. The unusual chemical conditions at the bottom of Fossil Lake, part of the Green River formation, slowed bacterial decomposition, prevented scavengers from
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