PART IT, SOUTH-WESTERN SHEET 
THE GRANT) CANON THST'PI CT. ATLAS SHf-'KI’ XIII 
112 “ 35 ' 
112 ° 30 
3 f' ;• i j i ‘ 1 Mi|c = I Inc] l. Hi ■ ; r-i;. 
S P' MR 
Hen', i A,- in I E ] dTlE'X 
GIEOAOSIC MAP DT IPfflfe GfflAWB CATTD1T T. 
UNITED STATES GEOLOGICAL SURVEY 
An I ' rev 
A 
Ur. I Wall 
W* 
Arcliiiian 
AH 
Tlic areas designated as Archaean eiMiram mmiftrpus irregular masses of Silurian anil 
probably oilier lower Paleozoic- rorks which rariiH'i separated at piv.-sriu from (he Arciicean 
