the Great Basin and are lost in the Great Salt
Lake and other bodies of water that have no drainage to the sea. The
general surface of this upper region is from 5,000 to 8,000 feet above
sea level, though the channels of the streams are cut much lower.

This high region, on the east, north, and west, is set with ranges of
snow-clad mountains attaining an altitude above the sea varying from
8,000 to 14,000 feet. All winter long snow falls on its mountain-crested
rim, filling the gorges, half burying the forests, and covering the
crags and peaks with a mantle woven by the winds from the waves of the
sea. When the summer sun comes this snow melts and tumbles down the
mountain sides in millions of cascades. A million cascade brooks unite
to form a thousand torrent creeks; a thousand torrent creeks unite to
form half a hundred rivers beset with cataracts; half a hundred roaring
rivers unite to form the Colorado, which rolls, a mad, turbid stream,
into the Gulf of California.

Consider the action of one of these streams. Its source is in the
mountains, where the snows fall; its course, through the arid plains.
Now, if at the river's flood storms were falling on the plains, its
channel would be cut but little faster than the adjacent country would
be washed, and the general level would thus be preserved; but under the
conditions here mentioned, the river continually deepens its beds; so
all the streams cut deeper and still deeper, until their banks are
towering cliffs of solid rock. These deep, narrow gorges are called
canyons.

For more than a thousand miles along its course the Colorado has cut for
itself such a canyon; but at some few points where lateral streams join
it the canyon is broken, and these narrow, transverse valleys divide it
into a series of canyons.

The Virgen, Kanab, Paria, Escalante, Fremont, San Rafael, Price, and
Uinta on the west, the Grand, White, Yampa, San Juan, and Colorado
Chiquito on the east, have also cut for themselves such narrow winding
gorges, or deep canyons. Every river entering these has cut another
canyon; every lateral creek has cut a canyon; every brook runs in a
canyon; every rill born of a shower and born again of a shower and
living only during these showers has cut for itself a canyon; so that
the whole upper portion of the basin of the Colorado is traversed by a
labyrinth of these deep gorges.

Owing to a great variety of geological conditions, these canyons differ
much in g