Stylemys nebrascensis (fossil tortoise/turtle) Ouranosaurus The narwhal was one of

The narwhal was one of many species described by Carolus Linnaeus in his publication Systema Naturae in 1758

Calamites (horsetails) are characterized by a stiff central stem or trunk with regular intervals of whorls of upswept leaves (similar to inverted umbrellas)

an evolutionary line that seems to have disappeared from the fossil record only to reappear much later

the enormous volume of skeletal material controlled the sedimentary environment

found associated

Stylemys nebrascensis (fossil tortoise/turtle) Ouranosaurus The narwhal was one ofOligocene Age White River Formation Wyoming Stylemys was a dry land tortoise found in the Oreodont beds (Middle Oligocene) of the White River badlands of South Dakota and northwestern Nebraska. They are also quite common in the late Eocene and early Oligocene White River badlands of eastern Wyoming. Stylemys was first described in 1851 by Dr. Joseph Leidy. It is the earliest discovered fossil turtle in America. This specimen is one of the few ever