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Yes, there really is a Petoskey Stone!

Petoskey Stones are fossilized colony corals (Hexagonaria percarinata). Their origin is traced back to Devonian seas that covered Michigan's Lower Peninsula about 350 million years ago.

The soft, living tissue of corals is called the polyp. A limey substance is secreted by the polyp, hardening into corallite -- a skeletal base which supports the polyp and keeps it from being buried alive by bottom debris. Petoskey stones found in Michigan consist of massive corallas of varying sizes. The limey skeletons were replaced by calcite or silica in a cell-by-cell process called petrifaction.

When glaciers scraped the bedrock surface, fragments of this rock were carried and deposited elsewhere, primarily in the north half of the Lower Peninsula. In 1965, the Michigan legislature became the first in the nation to select a fossil as its state stone.

Petoskey stones may be found on beaches, road cuts, ditches, gravel pits and sand blows all over the state. Similar fossils of the Hexagonaria genus occur in many parts of the world, but the "percarinata" is limited to the Traverse Group.

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Bailey's Place - Petoskey Stones & Stuff

Member Since: October 1993
2017 US 31 North
Petoskey, MI 49770
Phone: (231) 347-8043
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Baker Metal Works

Member Since: October 1997
310 Howard St.
Petoskey, MI 49770
Phone: (231)348-7034
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Grandpa Shorter's Gifts

Member Since: May 1956
301 E. Lake St.
Petoskey, MI 49770-0545
Phone: (231) 347-2603
Fax: (231) 347-4512
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Kelly's Hallmark

Member Since: January 1989
1139 US 31 North
Petoskey, MI 49770
Phone: (231) 347-5540
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Linda Michaels, formerly Little Traverse Jewelers

Member Since: December 1999
313 E. Lake St.
Petoskey, MI 49770
Phone: (231) 347-0261
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Northgoods

Member Since: December 2012
306 Howard Street
Petoskey, MI 49770
Phone: (231) 347-1775
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Sturgeon River Pottery

Member Since: September 1986
3031 Charlevoix Avenue
Petoskey, MI 49770
Phone: (231) 347-0590
Fax: (231) 347-9907
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Petoskey Regional Chamber of Commerce
401 East Mitchell Street · Phone: (231) 347-4150 · Fax: (231) 348-1810 ·
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