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Sum11.208.CenVolcanism3

Sum11.208.CenVolcanism3 - High Cascades Volcanic Episodes...

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High Cascades Modern Volcanoes of the Pacific NW Mt. St. Helens, July 27, 2005 Volcanic Episodes 65 55 45 35 25 15 0 5 Age (Myrs) Western Cascade Arc (37-15 Myrs) Challis Arc (55-42 Myrs) High Cascade Arc (5-0 Myrs) Columbia River Basalts (17-6 Myrs, Most 17-14 Myrs) Yellowstone Hot Spot (14-0 Myrs) West & High Cascades G-1 West Cascade Arc (37-15 Myrs) High Cascade Arc (5-0 Myrs) Cascade Volcanoes G-1
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