280 THE AEDEN SANDSTONE GROUP OF WABWICKSHIEE. [JunO I9I2, 



blown sand was deposited in the sea to a greater distance from 

 land than was perhaps generally supposed. 



Mr. G. W. Lamplugh, referring to the comments of the last 

 speaker on rounded sand-grains in marine deposits, recalled 

 attention to the well-known observations of Mr. A. E. Hunt on 

 sands on the sea-floor in the English Channel, which seemed 

 clearl}' to prove that the grains could be rounded by current- 

 trituration as well as by wi ad-drift. 



The AuTHOE, in reply, thanked the President and Fellows for 

 the kind reception given to his paper, and looked forward to 

 valuable results from Mr. Wills's investigation of the fauna and 

 flora. The detailed evidence for the view that the Arden Sand- 

 stone Group formed a continuous though variable belt was given 

 in the paper. As to the contour-map, the lines drawn were not 

 inserted from dips but from outcrops, and were the outcome of an 

 honest attempt to express the results of the mapping in contour 

 form, without any preconceived idea as to the form which they 

 would assume. The undulations were really very slight, and the 

 extent to which the contours were attributable to true folding, and 

 how far they were modified by other agencies such as contraction 

 of the strata during consolidation (as suggested by Mr. Bos worth), 

 solution of rock-salt and gypsum, or by an original slope in the 

 surface of deposition, would be a useful subject for future enquiry. 



He had hoped to utilize the results of his mapping as a basis for 

 investigation into the lithology and origin of the Keuper Marls ; 

 but, as he had now left the district, he hoped that other workers 

 would take up this line of research. 



