Shark fossils are extremely rare because sharks have no bones, only cartilage, which does not fossilize well. Read More
Like most sharks, Megalodon’s teeth were probably located in rows which rotated into use as they were needed. Most sharks have about 3-5 rows of teeth at any time. The front set does most of the work. The first two rows are used for obtaining prey, the other rows rotate into place as they are needed. As teeth are lost, broken, or worn down, they are replaced by new teeth. Megalodon may have had hundreds of teeth at one time. It did not chew their food like we do, but gulped it down whole in very large chunks.
Megalodon lived from roughly 25 to 1.6 million years ago, during the Miocene and Pliocene epochs. It is now extinct, but the exact time of its extinction is hotly debated. Fossilized Megalodon teeth up to 6.5 inches (17 cm) long have been found in Europe, India, Oceania (the general area around Australia including New Zealand, New Caledonia, etc.), North America, and South America. Carcharodon megalodon was named by Agassiz in 1843. There is some debate as to whether megalodon was an ancestor of the Great White Shark or was an evolutionary dead end.