UNITED STATES GEOLOGICAL SURVEY. 
THE GRAND CANON DISTRICT. ATLAS SHEER XXL 
Scalp 2^o'oori . about -5 miles to one Inch 
Geology liv C.E. DUTTON 
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ON 
GDODODTC MAF 01* IBS MD.3D20TC TDEAACD S OJ 1 THE BRAND CANON DISTRICT 
Jura AND THE SOUTHEUN PORTIONS OF THE HIGH PT \TF \(JS c»»ceou* *>**2 
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Trias 
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Quaternary Trachyte & Rhyolite Basalt 
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