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You are here: Home>Find maps>Pacific NW Proj. geologic maps>North Cascades geologic maps> NorthCascades geol.map index |
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Find North Cascades geologic mapsMount BakerSauk River Skykomish River Snoqualmie Pass Robinson Mountain Twisp Chelan Wenatchee
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Geologic maps and databases of the North Cascades
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Click on index map for geologic map,
availability, reference lists, and other information about quadrangle.
In 1975, the North Cascades geologic mapping project was born of a need to understand the geologic setting of significant crustal earthquakes in the North Cascade region. The project evolved to produce geologic maps of 8 1:100,000 scale quadrangles covering most of the North Cascades and the Methow River region on the east (See Figure). Most of the project field work is done. Maps and reports are available and some are still in preparation. For a history of the North Cascades project, click here. Link to The Geology of the North Cascades: a Mountain Mosaic, a non-technical explanation of North Cascade geology..
Availability of ROCK SAMPLES from the North Cascades Project |
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Miocene flood basalts |
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Tertiary extensional basin deposits and volcanic rocks of the Cascade Volcanic arc |
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Regionally metamorphosed rocks of the North Cascades crystalline core |
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Unmetamorphosed Mesozoic and Paleozoic marine rocks |
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Thrust plates of the Northwest Cascades System, the Helena-Haystack melange,the Eastern and Western melange belts and the Ingalls terrane |
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Mostly metamorphic and igneous rocks of the Quesnellia Terrane |
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This site is maintained by the Pacific Northwest Geologic Mapping and Urban Hazards Project of the Western Earth Surface Processes Team, Geologic Division, U.S. Geological Survey
The URL of this page is http://geology.wr.usgs.gov/wgmt/pacnw/nc/index.html
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