UNITED STATES GEOLOGICAL SURVEY 
THE GRAND CANON DISTRICT. ATLAS SHEET XI 
Auhivv 
Senile I mile =1 Inch,oi* eatascj 
GP DP 0 D1 D MAP 
DP TAP SOIMEWH PAST OP TAP KATRATi PIATPAIJ 
Geology bv CE DUTTON 
Red Wall 
W 
Arch; earn. 
AR 
The areas designated as Irdiasai contain numerous irregular 
