U. S. GEOGRAPHICAL SURVEYS WEST of tiie 100 TV MERIDIAN 
PARTS OF SOUTHERN COLORADO and NORTHERN NEW MEXICO-ATLAS SHEET No. 70 (A] 
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4 3 2 1 
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Scale 1 IilcIi to 4 miles ot 1 : 2 53 440. 
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1st. Lieut. Geo. XI. Wheeler, Corps of Engineers U. S. Array 
Prof. JoJui J. Stevenson, Geological Assistant. 
CRETACEOUS QUATERNARY IGNEOUS ROCK 
Archaean 
BY ORDER OF 
Carboniferous 
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THE HONORABLE THI 
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0 SECRETARY OF WAR 
Colorado 
Laramie 
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UNDER THE DIRECTION 
Alluvium (Lake Basins) 
Drift Conglomerate 
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Trachyte andKhyolile 
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IT 
OF BRIG. GEN. H. G. WRIGHT, CHIEF OF ENGINEERS 
Basal I 
U. S. ARMY. 
