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Geologic Map
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Generalized Geologic Map of the Conterminous United States
North America Shaded Relief


  The North American Tapestry of Time and Terrain

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Olympic Peninsula


close up of the Olympic Peninsula

Photograph mountains in the Olympic Peninsula, Washington.   Photo by Timothy Lesle


The mountains in the Olympic Peninsula of northwest Washington State are quite young. This triangular pattern took form in Tertiary time as the western margin of North America-much like its earlier Appalachian counterpart-grew through the accretion of several geologic terranes, pieces of drifting oceanic crust that stuck to the edge of the continent.