Sturdevant, G.E., 1927, Theories relating to origin of the canyon: Grand Canyon Nature Notes, v. 1, p. 2-3. Authors Sturdevant, G.E. Publication Date 1927 Citation Grand Canyon Nature Notes, v. 1, p. 2-3. State AZ Province CP TR County CN MO Placenames Marble Canyon Keywords Landscape Evolution Geomorphology More Keywords Landscape Evolution, Geomorphology, AzGeoBib RefNum 9867