State Symbols Game
Try again. The American mastodon (scientific name Mammut americanum) is not the State Fossil of Illinois.
The American mastodon is found in Illinois rocks and sediments between 3.75 million and 10,000 years old. It is related to elephants and mammoths. The mastodon went extinct near the end of the last Ice Age.
Find out more about the American mastodon in the The Midwestern U.S. 16,000 Years Ago exhibit.