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Geological Petroleum
near-complete fossil specimen
heterodon is from the Eocene-age Wasatch Formation of Wyoming
Its tail was sheathed in a lattice of bony rods but was flexible at the base
Priscacara, Green River Fossil Fish Ouranosaurus Geological PetroleumThe genus Priscacara is perhaps the most popular of the Green River fish fossils. A member of the Family Priscacaridae, the name Priscacara means "primitive head". Shaped rather like a sunfish, the genus sports sturdy, protective dorsal and anal spines. Among the two species, liops and serrata, serrata is uncommon. Liops is the smaller species, never exceeding 6 inches, whereas serrata have been found up to 14 inches. The genus went extinct at the end