From the end of the Ice Age, about 10,000 years ago the earliest hunters were stalking both mammoths and mastodons. Evidence of those times were found in Gallatin county. During the last Ice Age glaciers extended midway across the area.
Today traveling east and west across the county one can easily see the results of the glaciation.
The northern part of the county is relatively flat while the southern part of the county is quite hilly. The tooth shown above was discovered in 1976 on the north end of Dead Man's Island in the Wabash River. Eighth grade students decided that this was a mastodon tooth based on information that they saw in the Smithsonian Museum of Natural History. This tooth had groves in it while the mammoth tooth had a smooth surface. Mastodons occupied woodland areas browsing on leaves and bark.