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Horseshoe Park Fan covers 70 ha and formed in a few hours after a dam broke in the Rocky Mountain National Park, U.S.A. Sediments range from coarse boulder beds up to 10 m thick, to gravel braid bars, braided stream sands, sandy sheet sands, and finally fine distal sands and desiccated muds. The horizontal transition from boulders to mud occurs in only 1.5 km.  相似文献   

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