AND NEIGHBOURHOOD. 225 



this deposit, and their present external characters. 

 The specimens were not selected out of the clay, 

 but were picked up promiscuously from the stones 

 thrown out by workmen when they were digging 

 the clay during winter. All the rocks are found 

 in situ to the north and north-west of Manchester. 



On the Large Boulders found in 

 THE Till. 



These are well known in the neighbourhood of 

 Manchester, and are generally found dispersed 

 throughout the deposit. They are both more 

 numerous and of much larger size in some localities 

 than in others. Thus, for instance, on the rising 

 ground above Broughton Spout, and at Park 

 Place, Stony Knolls, and near the Vauxhall Gar- 

 dens, Collyhurst, larger than average specimens 

 have been met with. 



The following are the largest and most interest- 

 ing blocks that have come under my observation. 

 A piece of hard Greenstone, showing many stricBy 

 having most of its sides angular, but one smoothed, 

 weighing near a ton, and now lying on the new road 

 above the house lately occupied by Mr. Thomas 

 Swallow. 



Gg 



