Scientific name: Diplomystus dentatus - Fossil Fish Location: Kemmerer, Wyoming Geological Formation: Green River Fm Age: Eocene ( 56 million years) Size: 15,5cm long (The fish) - Plate: 18cm x 12,5cm x 1cm Ref: 1040 Diplomystus dentatus morphology, including its upturned mouth, is prototypic of a surface-feeding fish. The genus is herrings that likely fed on small surface-dwelling fish as Knightia is evidenced by numerous fossils found with Knightia in the stomach or mouth. Fifty million years ago ancient Fossil Lake existed in what is now southwest Wyoming. The unusual chemistry of fossil lake prevented decay and scavenging of dead organisms while millimeter-thick layers of alternating limestone matter slowly accumulated. The result is laminated limestones that contained the highest concentration of fossil fish in the world. All our fossils comes with Certificate of Authenticity.