Petoskey and Charlevoix stones are both fossilized coral from the Devonian Age, found in Michigan.

Petoskey stones have a larger, more symmetrical hexagonal pattern than Charlevoix stones.

With a few weeks left until fall weather makes beachcombing uncomfortable, many are out along northern Michigan beaches looking for Petoskey stones.

But people often find Charlevoix stones, which look very similar to those who are experienced in telling the two coral fossils apart.

Both types of stone are fossilized corals that are about 350 million years old, according to Visit Charlevoix .

The Charlevoix stone, although similar in appearance to its cousin, has its own unique features and structure.

Here's what to know about Petoskey and Charlevoix stones, and where you can find them in Michigan

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