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the lowest levels in the water column could not support much life and was devoid of oxygen
Flow tank experiments show that Dactylioceras was probably a slow swimmer
suggesting they swallowed the stones to help with digestion or perhaps provide ballast as they swam
amazing one inch proboscis
Priscacara, Authentic 5.75 Inch Green River Fossil Fish Troodon the lowest levels in theThe 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