VOLCANIC ROCKS AND PROCESSES
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Pyroclastic deposits of 3.5Ka Minoan eruption, Santorini, Greece. Air-fall pumice at base; base-surge deposit at head level of upper most students; low temperature ash flow forms white cliffs above; high temperature ignimbrite forms gray cap. (180324-28)Download Image
Lava Flows of Grande Ronde and overlying Wanapum basalts and deeply incised Palouse River, Washington (150703-38)Download Image
Ash flow tuff from caldera-forming eruption of Mt. Mazama to form Crater Lake about 7700 years ago, Crater Lake National Park, Oregon. The ash flow deposits erode into Pinnacles. The pinnacles are more resistant to erosion than the surrounding rock because of precipitation of minerals from gas escaping from the ash flow. (5D-8664)Download Image