CAPE COD GEOLOGY 



89 



Head the underlying clay is not well stored with water, and an adequate supply 

 for other than small household uses cannot everywhere be counted on. Wells 

 bored and sunk in the gravel on the south side of the uplands usually give fair 

 supplies. Similar conditions exist on Block Island, where, owing to the con- 

 tortion of the beds, experience alone can determine the practicability of obtain- 

 ing an adequate supply of water at any given site. In the Elizabeth Islands 

 several successful bored wells have been put down from 150 to 200 feet or more, 

 and for the most of this depth below sea level. 



