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The average weight of an adult narwhal is 1
5 metres (8
The Mississippian Age has been called "The Age of Crinoids
at the end of the Late Cretaceous Period
Stegosaurus Dorsal Plate Argentinosaurus The average weight of anNamed Stegosaurus, or "roof lizard" for it's large, flat dorsal plates, this herbivorous dinosaur is a classic favorite. Scientists debate the purpose of those trademark plates, but many suggest they were used to regulate heat. Filled with blood vessels, the plates could quickly warm the big plant eater when faced towards the sun. Stegosaurus sp. Late Jurassic (150 m. y. a.) Morrison Formation Cleveland Lloyd Quarry, Utah Shipping Included