Protostega gigas Fossil Sea Turtle Skull Stegosaurus Miacids are among the earliest

Miacids are among the earliest known Carnivores and probably represent a transitional group

and the last species

Mississippian System of Classification

South Dakota

Protostega gigas Fossil Sea Turtle Skull Stegosaurus Miacids are among the earliestProtostega gigas Fossil Sea Turtle Skull Protostega meaning (first roof) is an extinct genus of marine turtle containing a single species, Protostega gigas. Its fossil remains have been found in the Smoky Hill Chalk formation of western Kansas dated to 83. 5 million years ago. Fossil specimens of this species were first collected in 1871, and named by Edward Drinker Cope in 1872. With a length of 3 meters (9. 8 ft.), it is the second largest sea