CHAP. XIV. 



GLACIAL FORMATIONS IN ENGLAND. 



209 



throughout the northern hemisphere on both sides of the 

 Atlantic, the stratified drift of the glacial period is very com- 

 monly devoid of fossils, in spite of the occurrence here and 

 there, at the height of 500, 700, and even 1400 feet, of marine 

 shells. These, when met with, belong, with few exceptions, 

 to known living species. I am therefore unable to agree with 

 Mr. Kjei'ulf that the amount of former submergence can be 

 measured by the extreme height at which shells happen to 

 have been found. 



Glacial Formations in England. 



The mountains of Cumberland and Westmoreland, and the 

 English lake district, afford equally unequivocal vestiges of ice- 

 Fig. 38. 





Dome-shaped rocks, or "roches moutonnees," in the valley of the Rotha, near 

 Ambleside, from a drawing by E. Hull, F.G.S.® 



action not only in the form of polished and gi-ooved surfaces, 

 but also of those rounded bosses before mentioned as being so 

 abundant in the Alpine valleys of Switzerland, where glaciers 

 exist, or have existed. Mr. Hull has lately published a 

 faithful account of these jjhenomena, and has given a repre- 

 sentation of some of the English" roches moutonnees," which 



* Edinburgh New Philosophical Journal, vol. xi. pi. i. p. 31, 1S60. 



