Vol. 59.] BOULDER-CLAY IN ICELAND. 361 



their materials have in part gone to make up the ' palagonite- 

 moraines.' 



In short, I think that the evidence of the Snsefellsnes 

 sections lends a strong support to the view that the 

 palagonite- or breccia-formation of Iceland, is volcanic and glacial, 

 resulting from the action and the interaction of both causes, and 

 corresponds — at any rate, to a very considerable extent — in age to 

 the Pleistocene deposits of Europe : the glaciated doleritic lavas 

 (' pre-Glacial dolerites ') representing the most marked of the inter- 

 Glacial epochs. 



And here we have returned to the question raised at our starting- 

 point : Is it not possible that the absence of a palagonite-formation 

 in Great Britain may be ascribed to the fact that there the volcanic 

 fires had become extinct before the setting-in of Glacial conditions ? 



In conclusion, I desire to express my heartiest thanks to Mrs. 

 Disney Leith, of Westhall (Aberdeenshire), who has been kind 

 enough to give a most necessary polish to my somewhat angular 

 mode of expression. 



Discussion. 



The Chairman (Mr. Teall) remarked that the Author had set 

 forth his facts well and clearly, and the conclusion to which they 

 inevitably pointed — namely, that the palagonite-formation was, at 

 all events in part, contemporaneous with the Glacial Period — was 

 of very great interest. 



