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Meet: Petoskey Stones


In Michigan, one fossil holds a special place – the Petoskey Stone. This fossilized coral, with its distinctive honeycomb pattern, is not just a cherished treasure among rock enthusiasts, but also a symbol of Michigan's rich geological heritage.


Petoskey Stones, named after the city of Petoskey in Michigan, are fossilized remains of Hexagonaria percarinata, a coral species that flourished in the ancient Devonian Sea some 350 million years ago. As these corals died, their skeletons settled on the seabed, gradually fossilizing over eons. The distinctive honeycomb pattern makes Petoskey Stones easily recognizable and prized among collectors.


For centuries, indigenous tribes in the Great Lakes region revered these stones, often incorporating them into jewelry and tools. However, it wasn't until the mid-20th century that Petoskey Stones gained widespread recognition beyond Michigan, becoming sought-after souvenirs and collectibles.

For enthusiasts eager to embark on a Petoskey Stone hunting adventure, Michigan's shores offer prime hunting grounds. Here are some tips to enhance your rock hunting experience:

  1. Research and Preparation: Before setting out, familiarize yourself with the geological features of Petoskey Stones and the areas where they are commonly found. Online resources, guidebooks, and local rock clubs can provide valuable insights.

  2. Timing Matters: The best time to hunt for Petoskey Stones is after winter storms or during low tide when the waves have churned up the lake bed, revealing hidden treasures. Early mornings or late afternoons also offer ideal conditions, with softer light enhancing the visibility of stones. Your chances of finding a Petoskey stone are good any time of year if you have a sharp eye and some patience.

  3. Location, Location, Location: While Petoskey Stones can be found along the shores of Lake Michigan and Lake Huron, some locations yield better results than others. Popular spots include beaches near Petoskey, Charlevoix, and Traverse City. Be sure to obtain proper permits if hunting on private property.

  4. Keep an Eye Out: Scan the shoreline for stones with distinctive patterns and shapes. Petoskey Stones often blend in with other rocks, so a keen eye and patience are essential. Once you've spotted one, inspect the surface for the characteristic hexagonal pattern.

  5. Respect Nature: While hunting for Petoskey Stones, remember to tread lightly and leave no trace. Avoid disturbing wildlife and adhere to local regulations regarding rock collecting and beach access.


In the world of rock hunting, few treasures rival the allure of Petoskey Stones. With their ancient origins and captivating beauty, these fossilized corals continue to fascinate enthusiasts and serve as tangible links to Michigan's geological past.

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