Michigan's State Stone
Is found throughout the northern lower penninsula and, in particular on the beaches. The most popular area to find wave washed pieces is on the beaches of the western side of our state, near the town of Petoskey which give the stone its name.
Petoskey stone is a fossilized coral of the Devonian period. It, and many other fossils are common in our state.
The appearance of Petoskey stone sometimes leads to it being described as having a "Turtleback" pattern. This causes some confusion because our state gem stone also has a "turtleback" appearance. In our gem stone the pattern is the result of chemical processes, in our state stone it results from the growth of the original coral.
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