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Sum11.208.NorthCascades

Sum11.208.NorthCascades - C-3 Our Story So Far The Growth...

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The Growth of Western North America - Part II The Insular Superterrane, North Cascades & San Juan Islands Our Story So Far… C-3 Arrival of the Insular Superterrane Intermontaine Superterrane Insular Superterrane Methow Basin C-3 C-3 Intermontaine Superterrane Insular Superterrane Methow Basin North Cascades After Accretion Subduction zone relocates
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North Cascades at 100 Myrs Insular Superterane: Wrangellia Terrane Rocks: Basalts top: vesicles bottom: pillows Limestone Age: Triassic/Jurassic Source: Fossil clams and forams western Paci fi c Paleomagnetics ±15° N/S Type of Terrane: Hot Spot Islands Photo: Dr. ML.Bevier Oblique Collision Continent Terrane Oblique Collision Continent
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Oblique Collision Continent Oblique Collision Continent Terrane is “smeared out” along coast Insular Superterrane: Wrangellia C-2 Wrangellia & the North Cascades C-6 Intermontaine Superterrane Insular Superterrane Methow Basin “Microterranes”
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