46 
RECONNAISSANCE OF PART OF WESTERN ARIZONA. 
TOPOGRAPHY TAKEN FROM 
U. S. RECLAMATION SERVICE MAPS 
A 
/=^>^£ 
\->~N^_ 
•?-:^Vw:: : ••::••••: :s ; - ; .'| 
C 
D E 
F 

Vertical scale 
200 AOO 600 800 
iooo feet 
Fig. 12.— Map and sections of a part of the Great Colorado Valley, illustrating the lateral migrations 
of the river, the relation of the flood plain to the bluffs of the Chemehuevis gravel, and the corrugated 
slopes at the margins of the valley. 
