the sudden uplift of the Kaibab lends about 2000 feet more to the
already magnificent gorge. Along the end of the Kaibab the walls, for
a long distance, reach their greatest height, about 6000 feet, but
the other side is considerably lower than the north all the way
through. At the mouth of the Kanab the altitude of the river-bed is
1800 feet above the sea, showing a fall in the interval of 890 feet.
The greatest declivity is about 210 feet in 10 miles, in what is
termed the Kaibab division, extending from a point 10 miles below the
Little Colorado to a point 58 miles farther down. Here the smooth
stretches of river are long, the rapids short and violent. Here,
also, is the "granite," making the walls sombre, as the colour is
slaty to black. At the mouth of Diamond Creek the river is still 1300
feet higher than the sea, giving a fall of 500 feet from the Kanab.
There is another descent of 460 feet to the Grand Wash, and then 149
to the mouth of the Virgen. Next to the Kaibab division of the Grand
Canyon, the greatest declivity occurs in the Uinta region, in the
Canyon of Lodore. The profile of the river in these two districts is
approximately given on page 57. The average depth of the Grand Canyon
is about 4000 feet. Its width at the top varies from 4 1/2 to 12
miles. This is the extreme outer cliff-line. The inner gorge is much
narrower, at the Toroweap being only about 3500 feet. The river
varies in width from 500 or 600 feet to 75 or 100. In this canyon is
water-power enough to run the machinery of the world, and there is as
much more in the canyons above.

Joining Marble Canyon on the north is Glen, 149 miles long, from the
Paria to Fremont River. It has but one rapid of consequence. At high
water, with the exception of this rapid, the tide sweeps smoothly and
swiftly down with a majestic flow. The walls are homogeneous
sandstone, in places absolutely perpendicular for about a thousand