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| The North American Tapestry of Time and Terrain | |||
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| Features | |||
Olympic Peninsula |
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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. |
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