This is a fossilized Megalodon tooth, Latin name Carcharodon megalodon, from Cooper River near Charleston, South Carolina, USA. These sharks were the largest shark species to ever exist, and dominated the ocean for more than 15 million years. They could grow to over 50 feet long!
This is a high quality tooth with some of the outer enamel still on it. It has been water polished to smooth out the surface and give it a nice shine.
This tooth measure approximately 11cm long x 9.5cm wide x 2cm thick
