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COLORADO PLATEAU COLORADO PLATEAU 
CANYON LANDS SECTION C GRAND CANYON SECTION SECTION E 
Fig. 1.9 The Canyon Lands Section. This area is extremely 
diverse. Many parts of it are in the low basin of the Col 
orado River, seen in the foreground, and its barren, rocky 
plateaus are cut by intricate patterns of winding canyons. 
This area is very arid and streams and springs are very rare 
A number of narrow valleys have level bottoms, such as Moab 
Valley in the bacxground, and they have been developed for 
irrigation. In the eastern part of the section there are 
very wide irrigated valleys near Grand Junction. Providing 
further contrast are the local uplifts with forest clad 
slopes, such as 13,000 ft. ¿it. Peale in the background, over 
which a local storm, created by updrafts, is forming. Near 
iioab, Utah. October, 1947. 
Fig. 1.10 The Grand Canyon Section. The Colorado River nas 1 
carved a 4,000 ft. trench through nigh plateaus, dividing 
the section into two great plateau systems, the kaibab and 
Coconino Plateaus, seen in the bacxground. The surface of 
the upper stra.ta is resistant to erosion but the exposed 
faces weather rapidly. Limestone strata near the surface in. 
hlbit surface drainage and the underground drainage creates 
numerous springs. There is great contrast in local climate 
in the section, with its cold mountains, rising above the 
plateaus in places, its cool, forest clad plateaus, and its 
hot, barren canyons. Lower Grand Canyon, Arizona. 
October 1947. 
REPORT OF COMMISSION VII GVII-89