232 drift deposits of manchester 



Concluding Remarks. 



The deposit No. 1 bears every appearance of 

 having been formed by an ordinary current of 

 water. It was most probably caused by the sub- 

 sidence of the land beneath the waters of the sea 

 in which the Till was deposited. The rocks 

 found in this deposit, as well as those in No. 2, 

 are the same as those found in the Till, but nearly 

 all of them have lost their angles, and appear 

 water-worn. 



If my opinion, as to the beds of Till having 

 been partly formed by the stranding and dissolving 

 of icebergs, is true, the neighbourhood of Man- 

 chester was once the bottom of a deep sea, in the 

 waters of which floated immense masses of ice, 

 freighted with blocks of stone. That these ice- 

 bergs drifted about until some of them were 

 were melted, or arrested in their course by the 

 higher lands of Broughton and Collyhurst, then 

 forming sunken rocks, and it is to these circum- 

 stances most probably that we owe the greater 

 number of large stones now found in the Till at 

 those places. 



In the bed of Till at Collyhurst, the large block 



