Dating sharks teeth

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Scientists on Wednesday said the dinosaur, named Siamraptor suwati, was more than 26 feet 9 meters long and weighed at least 3. Siamraptor, the largest carnivorous dinosaur ever discovered in Thailand, lived during the Cretaceous Period in an environment centered on a meandering river system and preyed on plant-eating dinosaurs, the researchers said. The fossils include parts of the skull, backbone, limbs, hips and teeth.

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Shark teeth are made up of calcium phosphate, which is the mineral apatite.

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Their history goes back to at least million years ago, making the 2 million year history of humans seem quite insignificant by comparison. Most fossil evidence of early sharks exists as fossil teeth along with a few skin impressions. The earliest known evidence of sharks are fossil scales that date over million years ago during the early Silurian. During the Carboniferous Period, sharks went through a period of diversification resulting in the evolution of many new forms.

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