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"Area Geology" Top 5 Page for this destination North Cascades National Park Things to Do Tip by Basaic

  Area Geology
by Basaic

Some places in the park, like this cut along the highway, provide a fascinating glimpse into the geological past of the North Cascades. The rock you see here is predominately Orthogneiss Bedrock (the dark grey). 100 million years ago this rock was 15 miles below the earth's surface. Some 40 million years ago this rock was invaded by veins of quartz and feldspar (the lighter bands). The reddish deposits are Iron Oxide. These rocks were pushed up from below the surface to create the North Cascades.

Address: 810 State Route 20, Sedro-Woolley, WA 98284
Phone: (360) 854-7200

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  • Written Oct 22, 2011
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