MARYLAND GEOLOGICAL SURVEY 



CAMBRIAN AND ORDOVICIAN, PLATE III 



FlG. I. VIEW OF THJE GREAT VALLEY FROM SOUTH MOUNTAIN AT BLUE MOUNTAIN STATION. 



FlG. 2. VIEW ALONG ROAD BETWEEN PEN MAR AND HIGH ROCK, MARYLAND, SHOWING 

 MOUNTAIN SIDE COVERED WITH BLOCKS OF WEVERTON QUARTZITE. 



