From the Chester R. Longwell Photograph Collection (PH-00311). Old Slope is trenched deeply by stream course from largest canyon, which is building up a new fan-slope farther out. This trench is 125 ft. deep at canyon mouth and gradually fades out about 5 miles from the mountain front. Note the dissected rock bench at base of range. It is almost 1 mile wide, and is bounded by an old fault on each side. Note the nature surface at top of range. N IV-39.