Geology of area between Green and Colorado rivers, Grand and San Juan Counties, Utah

The area described in this report comprises about 900 square miles of arid land lying between the Green and Colorado Rivers south of the Denver & Rio Grande Western Railroad and southwest of the Salt Valley anticline. The rocks that crop out or that have been encountered in wells drilled in the area are all sedimentary and range in age from Pennsylvanian to Upper Cretaceous. Mesozoic strata are especially well represented. Including rocks that have been cut by drilling, the maximum thickness of the stratigraphic section is about 2 miles.