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CONES CRATERS AND CALDERAS
BEFORE MOUNT MAZAMA 2
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andesite ash fall ash flows basaltic bombs caldera floor caldera wall Cascade Range Cascade volcanoes Chapter cinder cones climactic eruption composite cones composite volcano cooling Crater Lake caldera Crater Lake National dacite dacite dome debris developed dikes erosion evidence explosive final eruptions flank fluid formed fumaroles gases geological geologists glacial activity glacial valley glaciers heat High Cascades Hillman inside the caldera lake floor lake level Lake National Park Lake's lapilli lava flows layers located magma chamber magnetic mass wastage massive Mazama ash Merriam Cone Mount Mazama mountain occur Oregon original particles Peak Picture portion produced pumice pyroclastic ejecta pyroclastic flows pyroclastic material radioactive carbon recent region represent result rhyolite ring fracture scoria sediments shield cones slopes subduction zone temperature tephra thick trench vent volcanic activity volcanic cone volcanic material volcanic rocks Williams Wizard Island