Sturdevant, G.E., 1928, What causes the canyon walls to recede?: Grand Canyon Nature Notes, v. 3, p. 1-3. Authors Sturdevant, G.E. Publication Date 1928 Citation Grand Canyon Nature Notes, v. 3, p. 1-3. State AZ Province CP TR County CN MO Placenames Marble Canyon Keywords Landscape Evolution Geomorphology More Keywords Landscape Evolution, Geomorphology, AzGeoBib RefNum 9869