Protostega gigas Fossil Sea Turtle Skull Stegosaurus South Dakota

South Dakota

Mississippian System of Classification

and the last species

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

dome-headed

Protostega gigas Fossil Sea Turtle Skull Stegosaurus South DakotaProtostega 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