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The Olympic Peninsula

Select a new feature About the Lower Tertiary
Olympic Peninsula
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The mountains in the Olympic Peninsula of northwest Washington State, which describe a backwards "C" on the map in yellow and light orange, are quite young. This crescentic 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, bits and pieces of drifting oceanic crust that collided with and became joined to the continent.

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U.S. Geological Survey
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Last Modification: 18 Oct 2000 (ebj)
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