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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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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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Main entrance of Balcoes Cave in Terceira Island
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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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This view of the western side of Mt Shasta was taken from the summit of Black Butte, a dacite dome located west of Mt Shasta alongside of Highway 5. Many features of Mt Shasta are visible in this view, including the classic West Face to Hidden Valley ski route and the satellite cone Shatina with its gaping Diller ...
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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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The Algar do Carvão (“Charcoal Pit”) is located in the central part of Terceira Island and, reclassified in 2004, is part of the Azores Regional Network of Protected Areas. The vent of the volcanic pit has 17 by 27 m size and is connected to a peculiar conduit, that ends in a lake of crystal clear water, around 80...
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This was taken just a bit in from the Peralta Trailhead in Arizona's Superstition Mountains. The calderas (collapsed volcanoes) that formed the Superstitions made spectacular scenery.
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The last Gigapan of the road trip from Pennsylvania to California came a day after the Tetons at Lake Tahoe. After leaving the Tetons we passed through Idaho Falls then crossed down in to northern Nevada. We drove as far as we could before spending the night in a hotel near a small town called Battle Mountain. Nor...
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We hit Devils Tower right after the Badlands, opting to skip stopping at Mt. Rushmore. Mt. Rushmore is an incredible feat of engineering and a great tribute to four undeniable american leaders but not a place I would regret not seeing... Although a bit anti-climatic after being in the Badlands, Devil's Tower was ...
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