176 



MAN AND THE GLACIAL PERIOD. 



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borough Head upon 

 the east to Moel 

 Tryfaen on the west, 

 and accept as evi- 

 dence of submer- 

 gence any true gla- 

 cial deposits (except, 

 as in the case of the 

 interior of Wales, 

 the deposits are ob- 

 viously the effects of 

 purely local glaciers 

 and contain, there- 

 fore, no shells), we 

 shall find that the 

 subsidence, if any, 

 must have been not 

 simply differential 

 but sporadic. 



" At Flamborousdi 

 Head shelly drift at- 

 tains an altitude of 

 400 feet, but half a 

 mile from the coast 

 the country is prac- 

 tically driftless even 

 at lower levels. The 

 Yorkshire Wolds 

 were not submerged. 

 On the western flanks 

 of the wolds drift 

 comes in at about 

 100 to 150 feet, and 

 persists, probably, 

 under the post-gla- 



cial 



warp, 



from 



