devonian, devonian period, carboniferous, carboniferous period, permian, permian period, mesozoic, mesozoic era, jurassic, jurassic period, cretaceous, cretaceous period, triassic, triassic period, cenozoic, cenozoic era, tertiary, tertiary period, eocene, eocene epoch, oligocene, oligocene epoch, miocene, miocene epoch, pliocene, pliocene epoch, quaternary, quaternary period, pleistocene, pleistocene epoch, holocene, holocene epoch, fossil, fossil teeth, fossil tooth, dinosaur, dinosaur tooth, dinosaur teeth, shark tooth, shark teeth, shark's teeth, shark's tooth, sharks' teeth, mososaur, megalodon, megalodon tooth, megalodon teeth, paleontology, vertebrate paleontology, dinosaur paleontology, shark paleontology, megalodon paleontology, tyrannosaur, velociraptor, deltadromaesaur, dromaesaur