View to the east (Note
change in view direction) with Buck Farm Canyon at the lower left and
the large entrenched meander of the Colorado River as it curves around
Point Hansbrough. The Eminence Fault is visible again extending from
the upper left edge, just grazing the river in the center, and
continuing through the point at the right edge.
The meander probably developed shortly after the Colorado
River found its new path across the Kaibab Plateau some 5.4 million
years ago. It is possible early activity along the fault may have
contributed to a meander at this location, but it seems more likely the
fault did not show any movement until the river was locked in its
present path. If the fault had been active 5 to 5.4 million years ago,
then there would have been an easily eroded zone along the fault, which
the river should have followed. However, the fault cuts through the
east rim in back of the point visible at the right edge, but the river
ignores this potential path. The implication is the fault did not
become active until after the river was stuck in its present path.
The fuzzy blue label at the far end of Point Hansbrough
marks the position of President Harding Rapid. The gradient in this
part of the canyon is still relatively flat, as the river has not
crossed the Eminence Fault yet.
This picture shows the same
meander around Point Hansbrough, but this time the view is toward the
west-southwest. The Eminence Fault enters at the center of the lower
edge (where the road reaches the rim of the canyon) and extends upward
to the left to where the narrow point out from the rim begins. A second
branch of the fault causes the “nick” further out on the
point.
Buck Farm Canyon is seen on the far side to the right of
the meander (upstream) while Saddle Canyon extends toward the top edge
to the left of the meander (downstream). In the far background, the
east slope of the Kaibab Plateau is visible while the upper left corner
catches a piece of Little Nankoweap Canyon.
Return to river
miles 32 to 40
Continue to river miles 48 to 56
Return to the
Index Page for the Grand Canyon Tour
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