Mount Washington (Oregon)
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Mount Washington is a shield volcano in the Cascade Range of Oregon. The mountain dates to the Late Pleistocene. However, it does have a line of basaltic andesite spatter cones on its northeast flank, which are approximately 1,330 years old according to carbon dating. The main peak is a volcanic plug that was heavily eroded by glaciers in the last ice age.
External links
- USGS page about Mount Washington (http://vulcan.wr.usgs.gov/Volcanoes/Mt_Washington/description_mt_washington.html) (reference)