Smithsonian miscellaneous collections . Plate 4 Upper: Near the mouth of the Escavada Wash the lower Cliff House sandstone in the northwall of Chaco Canyon has been scoured and blasted by wind-driven sand. Dunes have blockedthe old road to Farmington. Lower: Rainwater percolating through sandstone often results in a type of weathering calledstonelace. On the rock in the background water issuing from holes has left vertical streaks. (Photographs by O. C. Havens, 1924.)

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Keywords: ., bookcentury1800, bookdecade1860, bookidsmiths, booksubjectscience