UNITED STATES GEOLOGICAL SURVEY. 
PART El SOUTH-EASTERN SHEET. 
THE GRAND CANON DISTRICT. ATLAS SHEET XE 
Aubrey 
Red Wall 
Archaean 
Rl a 50“ 
S c al e ] Mile = 1 Inch, or ~s3ifeo 
_____ — — — — — Julius BifndCo.liih. 111 —MM ■ ■ 
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Geolo py "by C . E . DUTT 0 N 
The areas designated as Archaean, contain, numerous irreguki 
ar in a ss <--*•* r.r Hii. 
