- Mastodon State Historic Site near Imperial, MO, offers visitors a fascinating glimpse into the world of the prehistoric mastodons. The site covers 425 acres of an area known as the Kimmswick Bone Bed, one of the most extensive Pleistocene fossil areas in the country. Excavations at the site unearthed the bones of American mastodons along with stone weapons;the first proof that early man coexisted with the huge mammals. The skeleton of a mastodon, 10 feet high and 20 feet long, is on display at the site.
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