1'. S. GEOGHAPHICAL SURVEYS WEST of the 100 ™ MERIDIAN 
PARTS OF ATLAS SHEETS Nos. 69 (H) 69(D) 77 111 I and 76 (Al 
PART OF NORTH CENTRAL NEW MEXICO. ATLAS SHEETS 
TAOS 
' 6.950 s 
CerroColoj 
t rajpel<mg /f,jh 
PART OF NORTH CENTRA!. NEW MEXICO 
f • y * v 
e/op(Fe/yy- 
Archaean 
7V-.V/ 
Carboniferous 
Linear Outer 
Dakota 
CRETACEOUS 
Colorado 
,aramn : 
Alluvium 
(Lake Basins) 
QUATERNARY 
Olio. 
Trachyte and 
Rhyolite 
Costilla, 
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EXPEDITIONS of 1873,1878 and 1879 Under the Command of 
3 
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Scale 1 Inch to 4 miles or 1 : 253440. 
10 15 
1st. Lieut. Geo. AI. Wheeler, Corps of Engineers U. S.Arroy 
Prof. John ,.t Stevenson,Geological Assistant. 
Ni) T The Loup hark oTSJeeet hi.9 f). is -from, determinations of Prof Cope,- the. Carboniferous south ofJVamhe Creek, 
and west of Archaean,, from,!)?'. Oscar Jo ew. The northern extension, of this beltis petnuw conjectural. 
BY ORDER OF THE HONORABLE THE SECRETARY 0E WAR UNDER THE .DIRECTION OF BRIG. GEN. H. G. WRIGHT, CHIEF OF ENGINEERS U. S. ARMY 
