Swinehart, James B.Robert F. Diffendal Jr.,The Scottsbluff 1° x 2° quadrangle, in western Nebraska, is in the northern part of the High Plains section of the Great Plains Physiographic Province (Fenneman, 1931). The map area is mostly a constructional plain that has been dissected principally since the Pliocene by the rivers and streams that drain the area.PDFhttps://digitalcommons.unl.edu/diffendal/25engU.S. Geological SurveyPublicGeologic map of the Scottsbluff 1 degree x 2 degrees quadrangle, Nebraska and ColoradoMapsNebraska1997University of Nebraska-Lincoln