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Today crinoids live at great depths in the ocean
heterodon is from the Eocene-age Wasatch Formation of Wyoming
its main flight membrane was stretched between long back legs rather than its very short front limbs
and was subsequently able to restore it to it rightful place
Priscacara, Green River Fossil Fish Ouranosaurus Today crinoids live at greatThe 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