Scientists have confirmed that road crews unearthed the remains of a mastodon, an elephant-like mammal that became extinct shortly after humans arrived in the Great Lakes region between 10,000 and 12,000 years ago.

Scientists from the Cranbrook Institute of Science sifted through the site Monday in search of more remains, The Detroit News and the Detroit Free Press reported. They confirmed that the remains belonged to a mastodon.

The crews were working Friday with the Road Commission for Oakland County when they made the discovery. Officials have said the remains of more than 250 mastodons have been discovered in Michigan.