MACKINAW CITY, Mich. (AP) — Images from an underwater vehicle seem to reveal stone patterns on the bottom of the Straits of Mackinac in northern Michigan, possible evidence of Native American artifacts from thousands of years ago, a newspaper reported.

A group of amateur explorers raised money to look at Enbridge Inc.'s oil pipeline on the lake bottom. The four women hired a boat equipped with an underwater vehicle and side-scan sonar. It can map the sea floor based on sound.

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