2 4 



CONNECTICUT GEOL. AND NAT. HIST. SURVEY. 



[Bull. 



The level obtained at No. 8 is from a hole drilled within 50 

 feet of the river. The drill struck rock at an elevation of 316 

 feet after passing through 69 feet of quicksand, gravel, and till. 

 This is clearly not within the channel as it is quite impossible to 

 reconcile the figure with that at D, less than a mile distant. 



South of Jerusalem bridge at J, 150 feet from the river, a hole 

 was bored through 95 feet of clay, sand, and gravel before strik- 

 ing rock at an elevation of 298 feet. 



FIG. 5. Rocky River Valley. Diagram indicating lowest rock levels 

 which have been discovered by drilling. 



