Vol. 52.] BASALT-PLATEAUX OP NORTH-WESTERN EUROPE. 



355 



the conglomerate that overlies it ; water worn pebbles appear 

 among its contents, and rude traces of bedding begin to show them- 

 selves, until, within the course of a few feet, we pass upward into 

 an undoubted conglomerate. Elsewhere, however, and particularly 

 along the precipices west of Compass Hill, the two deposits are 



Fig. 15. — Section of the cliffs below Compass Hill, 

 Isle of Canna. 









more distinctly marked off from each other. The agglomerate has 

 there a hummocky, irregular upper surface, as if it had been thrown 

 down in heaps. The hollows between these protuberances have 

 been filled up with conglomerate and sandstone, forming the base 

 of the thick overlying deposits. 



Q. J. G. S. No. 206. 2 b 



