Petoskey stone

A Petoskey stone is a rock that is composed of a fossilized coral, Hexagonaria percarinata. The stones were formed as a result of glaciation, in which sheets of ice plucked stones from the bedrock, depositing them in the north part of Michigan's lower peninsula.

Related Topics:
Fossilized - Coral - Hexagonaria percarinata - Glaciation - Sheets of ice - Bedrock - Michigan - Lower peninsula

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Petoskey stones are found in the Gravel Point Formation of the Traverse Group and were originally deposited during the Devonian period. When dry the stone resembles ordinary limestone but when wet or polished using lapidary techniques, the distinctive mottled pattern of the fossil emerges. It is sometimes made into decorative objects. Other forms of fossilized coral are also found in the same location.

Related Topics:
Devonian - Limestone - Lapidary

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In 1965, it was named the state stone of Michigan.

Related Topics:
1965 - State stone

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