25 unpolished Lake Michigan Petosky Stones.

A Petosky Stone is a piece of fossilized rugose coral called Hexagonaria Percarinata, and dates to the Devonian Period, about 300-400 million years ago.

The stones have been sprayed with water in the photos, to best show the intricate patterns of the coral.

Overall photo of first side, followed by details of side one, and one overall of side 1 with the ruler.

Overall photo of second side - marked with red “2”, followed by details of side 2, marked with red “2”.

These 25 stones weigh about 1.75 lbs total and were found on the beach in Good Harbor Bay - in the area of the Sleeping Bear Sand Dunes.

Please, if any questions, please send message - I can not process returns at this time.