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Field geologists explore the rock layers tilted by faulting at the Cock's Comb (Utah)
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Another view of "the blues" in southern Utah, where blue-grey sedimentary rocks are exposed along Rte. 12. These rocks were formed from sediments deposited by a river around 100 million years ago (Cretaceous period, Kaiparowits formation)
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Continuing on Rte. 12 to the east of "On a Clear Day..." (www.gigapan.org/gigapans/32030/), the road drops down further into the Navajo sandstone - there are some great views of the bedding layers in these rocks. The angled "crossbeds" are ancient sand dunes preserved in the sandstone.
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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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Looking off into the distance from the ridge called the Cock's Comb (formed by a fault tilting layers of sedimentary rock).
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Volcaniclastic breccia from the May 18, 1980 eruption of Mount. St. Helens. Found approximately four miles northwest of Toutle, WA. To explore this sample's translucent features, click here: gigapan.com/gigapans/124815 Sample collected and contributed by Lee Gonzalez.
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This roadcut perserves ripple marks that are now nearly two billion years old. Tilted during the Penokean Orogeny, these rocks are also some of the oldest redbeds (evidence of an atmosphere with free oxygen) in the world.
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A little bit down the trail from the Stump Spring Trailhead, again with a nice view of the salmon-colored rocks of the Claron formation.
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Again with the tilted rocks....
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Viewed from Frederick County (Opequon Creek is the dividing line), you can see strata of the Ordovician-aged Edinburg Formation limestones and shales. These anticlines and synclines formed during Alleghanian mountain-building in the late Paleozoic. Another set of folds is just upstream: gigapan.org/gigapans...
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