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Giving macros another try with the new Stitcher 0.4.3510. Much better results, so far...
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The open pit at the top of the Homestake Gold Mine in Lead, South Dakota beautifully exposes a series of Tertiary rhyolite dikes that were the focus of the hydrothermal system that formed this rich gold deposit. The open pit is no longer active, but it is a great opportunity for geologists to get a glimpse into the up...
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Paulina Lake (left) and East Lake (in the distance) mark the depression of the Newberry Volcano Caldera. Unlike Crater Lake, Newberry's caldera is not the result of a single climactic eruption, but rather a number of eruptions over time. Newberry is also different from Crater Lake in that there are many more post-cal...
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A “Wonderland of Rocks” the Chiricahua Mountains are one of the many "sky island" ranges in southern Arizona. They rise like islands from the surrounding grassland "sea". Plants and animals from four ecosystems; Rocky Mountains, Sierra Madre Mountains, Sonoran & Chihuahuan Deserts, meet here...
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Collected in Owens Gorge, northwest of Bishop, California, this piece of Bishop Tuff illustrates flattening of pumice balls during initial burial.
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A gorgeous day and a spectacular view. From this point in southern Arizona one can see well into Mexico, including a long stretch of the Border Fence.
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From Negit Island in Mono Lake (at left) to the eastern edge of Long Valley Caldera (at right) stretches the arcuate chain of rhyolite domes and craters that make up the Mono-Inyo Craters. Active as recently as 750 years ago, this chain of volcanic vents is thought to rise from a single(?) feeder dike emplaced along t...
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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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