Day #41 Deskcrop: Petoskey Stone

Today’s deskcrop is for all the Michiganders out there – your state rock: Petoskey Stone. This distinctive looking rock is actually a Devonian colonial coral, Hexagonaria percarinata. Often sold in rock shops as a polished pebble, this sample is a rough one from the LaFarge limestone quarry near Alpena, MI.

Petoskey Stone

Explore this and all of my 2010 Deskcrops and Outcrops in Google Earth!

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