38 HISTORY OF CO H ASSET. 



Most of the scouring was done by smaller stones which 

 were themselves scratched, sometimes on both sides, as 

 they moved endwise more slowly than the mass above 

 them. The marks are not so distinct upon pieces of gran- 

 ite as upon the porphyrite or diabase, or especially upon 

 the few fragments of slate. 



Frequently one of these graving stones may be found in 

 stone walls where the hand of man has placed it on guard, 

 but millions of them are lying yet untouched in the glacial 

 till where they stopped their sliding. 



It is this till in the form of long rounded hills or drum- 

 lins that must now be considered ; for these hills are the 

 main part of the reimbursement for the soil that the glacier 

 froze on to and carried away. Turkey Hill, Deer Hill, 

 Town Hill, Reservoir Hill, and Church's Hill, in fact all of 

 our hills, are the aforementioned drumlins. 



They are made up mostly of rock flour that has been 

 scoured off and heaped up by the movement of the ice just 

 as sand bars form in a river bed wherever the sand happens 

 to lodge. 



When the Reservoir was dug, upon the top of Bear Hill, 

 picks were necessary in loosening the clay because the ice 

 had pressed it so hard in heaping it. Many stones were 

 .mixed in with the flour, some as large as a bushel basket, 

 and were pushed along until their corners were scoured 

 off and they were scratched into their present shape. 



The marks of this rough treatment are to be seen on 

 many of them now, running lengthwise with the stone as 

 they moved. Every loose stone originally was broken 

 from some ledge, and was jagged or sharp cornered, but 

 they are not so now, for they meekly submitted to the 

 great grinder. 



A very interesting illustration of the crushing move- 

 ment that made these hills has come to light in the dis- 

 covery of some fragments of clam shells in one of them. 

 When a well was being dug on the west side of King 



