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.

IMG_7701
Petoskey Stone

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

Bookmark the permalink.

Comments are closed.