OP THE BAGSHOT BEDS OF THE LONDON BASIN. l8o 



to last year's paper. He thought the Highclere section correctly 

 represented ; the Chalk and Woolwich and Heading Beds had a dip 

 of more than 30 degrees to the N., and there was room for the 

 London Clay and Lower and Middle Bagshots with that dip. The 

 existence of recognizable fossils and the character of the beds, such 

 as the absence of false-bedding, were strong evidence that the sand- 

 pit in which the fossils had been found was of Upper Bagshot age. 



Mr. Drew pointed to a remarkable case of thinning in Bearwood 

 Hill, where the whole of the Middle Bagshots are represented as 

 having suddenly disappeared. 



The ArxHOR said that the thinning-out referred to by Mr. Drew 

 would excite no surprise when drawn on a true scale. To 

 Mr. Monckton his reply was that his work had not ignored the 

 elementary rules of stratigraphy. The results, when mapped, were 

 different from those shown on the Survey Map, but they were de- 

 rived from evidence based on field-observations, and he was quite 

 prepared to have them tested on the ground. 



Q. J. G. S. No. 174. 



