U. S. GEOGRAPHICAL SURVEYS WEST of the 100 T" MERIDIAN 
PARTS OF ATLAS SHEETS Nos. 09(B) 69(D) 77 (B) and 7 8 IAI 
EXPEDITIONS of 1873,1878 and 1879 Under the Command of 
Scale 1 Inch, to 4 miles or 1 : 253 440. 
10 1 
1st. Lieut. Geo. M. Wheeler, Corps of Engineers U. S.Army 
-I- 
Prof. John J. Stevenson, Geological Assistant . 
A'O l' fi. 77u‘ Loup For it of Sheet 69 V, is from determinations ofliof Cope.; the Carboniferous south of Sambo Freeh , 
caul west of'Arctuieojir, fromJ>r. Oscar loew. The iwrthern extensions of this l)dt is partly com cdural. 
BA" ORDER OF THE HONORABLE THE SECRETARY OF WAR UNDER THE DIRECTION OF BRIG. GEN. H. G. WRIGHT, CHIEF OF ENGINEERS 
S. ARMY) 
