CHAP. XIV. GLACIAL FOKMATIONS IN ENGLAND. 269 



throughout the northern hemisphere en 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 1,400 feet, of marine 

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

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

 Mr. Kjerulf 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 Botha, 

 near Ambleside, from a drawing by E. Hull, F.G-.S.* 



action not only in the form of polished and grooved 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 phenomena, and has given a repre 

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



* Edinburgh New Philosophical Journal, vol. xi. pi. i. p. 31, 1860. 



