Death Valley National Park, California. Contrast between No. 3 (right) and No. 4(left) gravels. No. 3 gravels are stained with desert varnish; No. 4 gravels, being subject to washing at the present time, are not. No. 3 gravels are firmly embedded in the ground; No. 4 gravels are loose. The No. 3 gravel here is without vegetation because, being more compact than the No. 4, less water infiltrates the ground. Photo by J.R. Stacy, circa 1960. Figure 62, U.S. Geological Survey Professional Paper 494-A.
Digital File:hcb00981

ID. Hunt, C.B. 981