From this story in the UK Daily Mail:
_It makes the Great White shark in Jaws look like a goldfish. But this giant prehistoric shark jaw comes from the largest predator ever to have existed on Earth. The 16-metre long Megalodon shark, which died out 1.5 million years ago, was once the true king of the ocean, weighing an awesome 100 tons. It took famed fossil hunter Vito 'Megalodon' Bertucci almost 20 years to reconstruct the jaw, the largest ever assembled and which measures 11ft across and is almost 9ft tall.
_The late Mr Bertucci found fragments of the ferocious species in the rivers of South Carolina. The jaw set is composed of 182 fossil teeth, some over seven inches long and is expected to sell for $700,000 (£436,000) at a sale by Heritage Auctions in Dallas, Texas, on 12 June. Megalodon ruled the temperate and warm waters of all the oceans between 25million and 1.5million years ago.