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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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Legend and Rock Ages
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Olympic-Wallowa Line

  Close-up of
 the Olympic-Wallowa LineThe northwest-southeast trending Olympic-Wallowa Line in southern Washington state is a structural zone that includes active earthquake faults. This trend was first described from aerial photographs by Erwin Raisz in 1939. Other northwest-trending alignments to the southeast, west of the central Rocky Mountains, may be related geologically to this feature.