U. S. GEOLOGICAL SURVEY 
BULLETIN NO. 313 PL. IV 
A. HURRICANE ISLE QUARRY; EASTERN END. 
Showing the lower 60-foot sheet overlain by 20-foot sheet and crossed by vertical east-west joint and by 
diagonal joint. 
B. STINCHFIELD QUARRY NEAR HALLOWELL LOOKING WEST-NORTHWEST. 
Showing the sheets gradually increasing in thickness downward, crossed by joint ( C) and overlain by 
glacial drift. 
