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The first true Crinoids appeared during the Lower Ordovician
by way of the northern border of the Tethys Sea
Vendian rocks contain trace fossils
At the moment it still resides within A
Even if KNM-ER 1470 was considered a large H
Stegosaurus skull Styracosaurus The first true Crinoids appearedNamed 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. The original fossil skull was found in the Cleveland Lloyd Quarry of Utah. Stegosaurus was a large herbivore with two rows
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