Select options This product has multiple variants. The options may be chosen on the product page Mastodon Bone at 5x $19.00 – $400.00 Mastodons are any species of extinct proboscideans in the genus Mammut, distantly related to elephants, that inhabited North and Central America during the late Miocene or late Pliocene up to their extinction at the end of the Pleistocene 10,000 to 11,000 years ago.