The La Plata Mountains as seen from above the authorís

Durango Bill's

Grand Canyon 3-D Tour

Mile 184 to the Hurricane Fault at 192 Mile Canyon
Grand Canyon Miles 184 to 192

3-D view of the
            Grand Canyon - centered at Mile 186

   View to the southwest. Mile marker 184 is just above the lower edge of the picture where the Colorado River begins to curve back toward the left. There are multiple lava flows and volcanic cinder cones in this section with several cinder cones visible to the right of the river. The river meets multiple local branches within the Hurricane Fault Zone in the middle distance where it turns left again (just before Whitmore Wash/Canyon).

   This area is on the west side of the Toroweap Fault and thus on the "down" side. Hence there has been less net downward cutting by the river over the last million years. The inner gorge thus records a million year cyclic history of canyon cutting, partial filling by lava flows, followed by more canyon cutting, more lava flows, etc.

   The Bright Angel Shale that surfaced to the east of the Toroweap Fault is initially dropped back below the surface west of the Toroweap Fault, but the strata still tilt upward toward the west. Within a few miles the Bright Angel surfaces again as well as the lower Tapeats Sandstone and the top few feet of the underlying Precambrian schist and granite. Then, west of the Hurricane Fault, these layers are dropped below the surface again.

3-D view of the Grand Canyon -
              centered at Mile 190

   View to the west-southwest with Whitmore Wash/Canyon in the lower right quadrant. The Hurricane Fault enters from the lower right edge (several local branches) and continues across the picture through 192 Mile Canyon to the upper left corner. The strata layers on the far side have been faulted downward by some 1,300 feet. (The picture below illustrates this.) In the upper left quadrant of the picture, erosion along the Hurricane Fault Zone has created 192 Mile Canyon. However, the creek that comes down the upper part of the fault zone follows a drainage pattern established before the Hurricane Fault was active, and ignores the fault by turning westward to join the Colorado River at mile 193.

Low angle view along the Hurricane
                  Fault illustrates the displacement

   This view looking due north from about Mile 192 covers the same area as that shown above, but looks along the fault zone to illustrate the 1,300-foot displacement. The topmost surface rock on both sides of the fault is the Kaibab Limestone. An even better guideline is the Esplanade surface of the Supai Group. To the right of the fault (east) the Esplanade surface forms the sloping surface starting in the lower right corner. This same flattish layer is over 1,000 feet lower to the left of 192 Mile Canyon (which is in the center foreground).

Return to river miles 176 to 184

Continue to river miles 192 to 200

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