View to the west
with 140 Mile Canyon along the lower left edge and
Fishtail Canyon to the right. Kanab Creek enters from the
upper right edge while Fishtail Mesa is between Kanab and
Fishtail Canyons. As we go downstream from here, the
Kaibab/Toroweap/Coconino cliff that marks the outer rim of
the canyon gets further away from the river while the flat
Esplanade surface becomes more predominate.
The inner canyon becomes precipitous for the
next 25 river miles as the strata containing the
slope-forming Bright Angel Shale dips below river level.
This brings the Redwall/Muav Limestone layers down to
river level, and this combination produces a massive
cliff. Another factor contributing to the steep inner
gorge is the river's canyon-cutting that has propagated
upstream from the Toroweap Fault.
The Sinyala Fault extends diagonally up and
left from the center of the lower edge. Past movement
along the fault has fractured the rocks making it easier
for erosion to start digging side canyons.
to river miles 128 to 136
river miles 144 to 152
the Index Page for the Grand Canyon Tour
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