^98 



ILLUSTRATIONS Ol 



which 



pofes the upper part of the h 



that fide, is a whinft 



h 



many examples 



as We 



f. 



breccia, fuch 

 d, I believe, very 



much refembling what is called a lava breed 



hy the volcanic geologifl 



Th 



ftony frag 



ments included in this compound mafs, are for 



the 



g 



part 



ded 



f whinft 



; and fome of them 

 others of porphyry, ft:rongIj 

 charaderized by redangular macuLx of feltfpar, 

 and many fcem to be of fandftone, but fo 

 liderably altered, as to leave it at leafl: difp 



con- 



ble 



hether they really are fo 



part, however, where the face of 



In 



rock 



one 



riy perpend 



a narrow ridge is feen 



Handing out from the reft, and of a different co- 

 lour, being more entirely covered with mofs 



than the 



k 



d ab 



it, and, as may be 



prefumed from that circumft 

 to decompofition. On ( 



xam 



ince, lefs liable 

 nation I found, 



that this ridge does not confift: of whinftone,but 

 of a 



very hard and 



ft 



hly confolidated fand 



It appears to be the edge of a ft 



of the thicknefs of about nine or ten inches, and 

 of the height of fifteen or fixteen feet. It is not 

 perfedly ftraight, but flightly waved, its general 



dire6tior 

 both fid 



being r 

 firmly 



arly vertical ; and it is on 



Wh 



flon 



b 



braced by 



hinfl 



1 



Ken, It app 



that th 



fand 



fembles in colour, and in everything 



but 



