Kent County road crews discovered mastodon bones while completing a dig this week.
Crews were working to replace a culvert along 22 Mile Road this week when they found a three-foot-long femur.
University of Michigan researchers confirmed the bone belonged to a mastodon, which was common in the area 12,000 years ago.
The bone will be fully excavated and processed through the University of Michigan.
The bones will then be taken to the Grand Rapids Public Museum.
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