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Rugged Arizona terrain viewed from an overlook of Fish Creek along the Apache Trail. The yellow rocks are thick layers of volcanic tuff from a gigantic caldera eruption that ocurred about 25 million years ago.
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Rugged Arizona terrain viewed from an overlook of Fish Creek along the Apache Trail. The yellow rocks are thick layers of volcanic tuff from a gigantic caldera eruption that ocurred about 25 million years ago.
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Debris flow deposits crop out on the banks of Bolam Creek on the north side of Mt Shasta. Note that the boulders in the creek bank comprise a poorly sorted, matrix supported, boulder conglomerate. Some of these debris flows occured as recently as 1997. One of the boulders on the right in this image has been documented ...
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Road cuts on Syskiyou Summit on Interstate 5 a few miles north of the California-Oregon border beautifully expose the volcaniclastic Colestin formation. The Colestin formation is early Oligocene (~34-28 Ma) in age and represents volcanic and depositional events closely following the initiation of Cascade volcanism. Clo...
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The Pinnacles National Monument is located in the Gabilan Range between the Salinas and San Benito Valleys in central California. The rock visible here is volcanic breccia that was eroded from siliceous volcanoes that erupted about 22-23 million years ago. Similar siliceous volcanic rocks occur at Neenach California, a...
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Panorama from Pinnacles West looking west from High Peaks Trail
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The Deer Mountain tephra cone consists of basaltic andesite (58% SiO2 and 9% MgO). Note the feeder dike in the middle of the image. Baker and others (1994) conducted experiments on these volcanic rocks and concluded that they originate as wet partial melts of the mantle.
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