This photo from Dragoon Wash shows older basin fill deposits, the lower darker sedimentary unit, overlain by a thick, lighter-colored, alluvial package from the ancestral Dragoon wash. The entire sequence was later cut by the San Pedro River providing for this marvelous exposure. (Photo by Joe Cook.)
Photographer: Joseph Cook
Photo Date: circa 2013
Photo Location Accuracy: Approximately Located
Photo Tags: Sediments, fluvial, alluvium, Dragoon Wash, St. David, San Pedro River 
