618 



THE ILLINOIS GLACIAL LOBE. 



in depth, penetrates 10 feet of clay, below which it is entirely in sand. A 

 well in section 22, altitude 580 feet, enters rock at about 27 feet (Udden). 

 Professor Udden reports the follow ing sections of deep wells south of Rock 

 River in the vicinity of Spring Hill: 1 



Wells near Spring Hill, Illinois. 



A well driller at Prophetstown informed the writer that he had struck 

 rock in one well near Spring Hill at 90 feet, and in anothei at about 100 

 feet. Probably the deepest well in the vicinity of Spring Hill is on the 

 farm of Mr. Heniy Smead, in sec. 31. This reached a depth of 215 feet, 

 and is thought by Mr. Smead to have terminated in a stony clay, apparently 

 till. As the well mouth is not more than 640 feet above tide, this section 

 indicates the presence of a very deep preglacial valley. 



Several families in the village of Spring Hill have obtained a supply 

 of water from a well only 20 feet in depth, sunk on low sandy ground east 

 of the village. A windmill forces the water to a tank, from which the water 

 is distributed through pipes to the dwelling's. The total expense, aside from 

 laying pipes, is only $5 per annum for each dwelling. The water thus 

 obtained is but moderately hard, and is preferred to the very hard water 

 obtained from the till encountered by wells in the village. In this conuec- 



1 Communicated to the writer. 



