Grenville Gneiss

Linked to Geologic History of Georgia

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The Grenville gneisses were formed around 1 billion years ago during the Grenville Orogeny. The oldest rocks in Georgia, these gneisses form the "basement" upon which younger rocks were deposited during the formation of the Appalachian mountain chain.

Photograph by Pamela J. W. Gore

Grenville Gneiss

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