U. S. GEOLOGICAL SURVEY 



PROFESSIONAL PAPER NO. 20 PL. XI 



A. QUARTZ GASH STRINGER VEINING IN FICKETT SERIES ON JOHN RIVER, IN ENDICOTT MOUNTAINS. 



Looking southeast. 



B. STRUCTURE IN ANAKTUVUK SERIES ON ANAKTUVUK RIVER. 

 Looking N. 10° W. 



