Ice- marks. 397 



ravines, at present under the sea, the records of former 

 glacial work, are being filled with clay, sand, unworn 

 and worn rock fragments, producing a counterpart of 

 some varieties of Boulder-clay. l I have quoted thus 

 far from Professor Hind's admirable memoir, for it 

 has sometimes been stated, that all the contorted 

 Boulder-clays and interbedded sand, with shells entire 

 and broken in England, were pushed bodily upon the land 

 by a vast advancing sheet of glacier-ice, even to heights 

 of a thousand and twelve hundred feet. As the British 

 Islands during the Glacial epoch were more than once 

 much in the same state as the north of Labrador, there 

 can be little doubt that some of the British glacial phe- 

 nomena were produced by the same causes. 



1 See 'Notes on some Geological Features of the North-East ern 

 Coast of Labrador,' by Henry Youle Hind, M.A., ' Canadian Natu- 

 ralist,' vol. viii. 



