V5(i 



C. CALLAWAY ON THE QUARTZ1TEB OF SHROPSHIRE. 



ridge, even in its lower elevations, as illustrated in fig. 1, which 

 cuts the range at more than half a mile to the north-east of the 

 summit ; hut in the Ercal and Lawrence Hill the quartz-rock fre- 

 quently rises to the level of the crest of the range, and at some 

 points overtops it. 



Fig. 1. — Section across the Wrekin, showing the relations of the 

 Quartzite. 



S.E. N.W. 



Faults. 



Fault. 



Scale about 8 inches to 1 mile. 



1. Bedded Precambrian volcanic tuff, dipping north. 



2. Quartzite. 



3. Hollybush Sandstone. 



4. Shineton Shales (Tremadoc). 



The next section (fig. 2) illustrates the relation of the quartzite to 

 tho volcanic rocks in Lawrence Hill, and will equally well apply to 

 the Ercal. 



The quartzite is succeeded, as in fig. 1, by the Hollybush Sand- 

 atone. 



Fig. 2. — Section across Lawrence Bill, showing the position of tlu 



Quartzite. 



Fault. 



1 . Bedded Precambrian volcanic tuft 1 , dipping to the north. 



2. Quartzite. 



Looking down upon the Ercal and Lawrence Hill from the Wrekin, 

 the line of the quartzite can be distinctly traced along Lawrence 



