Check the listing for details. Michigan Petoskey Stone Lot 2 Pound Unpolished Natural Great Lakes Fossil Coral. Condition: Used. Listed at 25.00 USD. You will receive the exact stones shown in the photos. These pieces show visible Petoskey coral structure along with the natural surface variation expected in Great Lakes shoreline fossils. 🪸 Petoskey stones originated as ancient coral colonies during the Devonian period, around 350 million years ago.
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