Yorkshire Xatiiralisfs at Buckden. 



273 



interestingf and — to one familiar with the Carboniferous rocks in 

 other districts — the splendid sections of the Yoredale rocks were 

 very striking-. During- the first and second days' excursions the 

 large amount of glacial drift on the banks of the Wharfe and 

 Buckden Beck was very noticeable. The boulders examined 

 were all local in character, thus confirming the views of pre- 

 vious workers that the ice which had left such distinct evidences 

 of its work was certainly not foreign. As pointed out by 

 Mr. Sheppard, a characteristic of the drift in several places was 

 the fact that, owing to the large quantity of comminuted lime- 



stone in it, the exposure to atmospheric influences had caused it 

 to harden into a concrete-like mass, very difi^erent from the 

 ordinary boulder clay. 



The character of the Yoredale rocks which forms a large 

 part of the sides of the dale, consisting of limestone with 

 shales and sandstone between, with the massive Great Scar 

 or Mountain Limestone at the base and the Millstone Grit 

 capping it, will no doubt explain many of the facts recorded 

 by the Botanical Section as to the limits of certain plants. 



iqo4 September i. s 



