Abstract
This short notice deals with the effect of highly intensive rainstorms (more than 25 mm/h or 8 mm/10 min.) on bare surfaces, producing cones and needles of earth up to 12 cm in cryptogamic surface layers of Canyonlands National Park by splash erosion, and widespread stone stripes resembling periglacial features on the steeper slopes (up to more than 40°) by rainwash in the areas of Red Canyon and Bryce Canyon National Park. A large amount of coarse material can be moved within a very short time, and the surface patterns survive at least for several months.
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