92 



ha,ving cut away the lower part and permitted re- 

 settlement, good examples may be seen in the heads 

 of the valleys, between Maidstone and Westerham and 

 along the Chathani and Dover Railway cutting, especially 

 that exposed on the East side of Boro' Green Rail- 

 way bridge. Glaciation has produced in the Weald,, 

 under the greensand escarpment, large spreads of what 

 may be likened to Boulder clay, and as in the case of 

 Boulder clay, the surface weathering has removed the finer 

 material, leaving thick layers of angular and half-worn 

 fragments of rock and pebbles. Near Shipbourne, this clay 

 extends over a considerable space, and may be met with 

 in a homogeneous condition, resembling Till, to a depth of 

 at least eight feet below the surface and I believe even 

 deeper. I think that the lower part of this may be of a 

 very early date. 



Besides the layers or coverings of trail and underplight, 

 over the whole country side which I have been describing 

 hitherto, there are signs of underplights and trails of earlier 

 date, but similar in kind. 



On hill tops and at their very apices masses of 

 ground disturbed by land ice may be found, which have 

 suffered so much from subsequent denudation as to make 

 it evident that they are not of the latest glaciation I 

 have already described, and this observation will be 

 strengthened by the frequent inability to perceive an 

 accordance between the direction of the folds and the 

 present inclination of the ground. 



Along the crest of the chalk downs, masses of tertiary 

 pebbles may be found which have been so worked up as 

 ■to present perfect confusion in their lower parts as if by 

 shore ice. 



In some, near the surface, the pebbles are pitted, scored, 

 and crushed even to sand and powder ; it is easy to find, 

 however, instances where the pit has not received the 

 impress from the pebble which at this moment lies nearest 

 to it, shewing later movement, while above this is red loam 



