Dakota Artesian System Small 320×37 Medium 640×75 Large 1024×120 Download Tiff Original 2400×281 | (113.2 KB) Description East-west section across South Dakota to show the Dakota artesian system. The Dakota sandstone is composed for the most part of well-rounded and well-assorted quartz grains, representing an ancient river and wind-formed sand deposit. Keywords artesian system, sandstone, South Dakota Galleries Geology Source: Amadeus W. Grabau A Textbook of Geology (Boston: D.C. Heath & Co., 1920) 424 Courtesy the private collection of Roy Winkelman
