456 MR. E. HULL ON THE DRIFT-DEPOSITS 



House^ by Clifton and Kearsley^ to Bolton Moor ; and, iii 

 a similar position, it occurs at Little Lever, Bradshaw, 

 Harwood, and Elton, near Bury. Its general tendency is 

 to form flat or gently rising surfaces, of a w*=et or marshy 

 character; while the Middle Sand forms undulating hanks, 

 hillocks, and knolls, such as that of Tandie Hill, which 

 reaches an elevation of 725 feet. Outliers of sand iand 

 gravel are also to be met with amongst tke^^hills, as at 

 Mossley, Lyme Park, and Bollington ; and these may 

 probably be referred to the same formation. ;')-i • 



The succession of these Drift- deposits now described bears 

 a remarkable resemblance to that exposed to view along 

 the cliffs north of Blackpool, described by Mr. Binney*. 

 But, although I am disposed to think they are the exact 

 equivalents, it would be rash to pronounce an opinion on 

 this point until a survey of the intermediate country has 

 been completed. 



The Position of the Drift-deposits with reference to the 

 older Rocks now requires our attention ; and in tracing the 

 boundaries of these different divisions we become sensible 

 of a universally pervading feature in their arrangement, 

 namely, that they rise in the direction of the hills, or con- 

 versely slope from the hills towards the plains. This is 

 true with regard to the high lands of millstone-grit which 

 range from east to west, by Bochdale, Bury, and Bolton, 

 as well as those which range from north to south, by Old- 

 ham, Staleybridge, Marple, and Macclesfield. This rise 

 of the beds of Drift, both towards the north and towards 

 the east, is more rapid than the slope of the brooks, until 

 they actually enter the uplands, when the descent of the 

 streams becomes in turn more rapid than that of the drift ; 

 and on this account the Lower Boulder-clay seldom ex- 

 tends into the valleys of the Pennine Chain, as already 

 stated. 



* Mem. Lit. & Phil. Society, vol. x. (new series). 



