io DESCRIPTION of the 



abounds, of a granular texture : it here, in general, refembles a 

 fine-grained, highly indurated, and compact quartz fandftone : 

 fometimes, however, it approaches to hornftone, and even fome- 

 times to quartz in mafs. Much of it has a white colour : the 

 reft is tinted of an ochery brown, of different fliades. In other 

 places, the ftratified matter confifts of a (tone of a laminated tex- 

 ture, with undulating lamellae of a ferruginous tint, looking like 

 an indurated fhale ; and various gradations of both kinds prefent 

 themfelves. This jumble is in thicknefs three hundred yards ; 

 and to it immediately fucceeds a very narrow ftratum of Argil- 

 lite, which is of a greenifh-grey colour, and very thinly lamel- 

 lated. 



This argillite is fucceeded by a bed of Whin, thirty- three feet 

 broad. This whin is of a dark blackiih-brown colour, and is of 

 a more compact texture, than the whin which I have defcribed 

 occurring in the grit, and is pofTefTed of more induration : the 

 materials of compofition are nearly the fame in both. 



Its general flretch is nearly from weft to eaft ; but in this 

 ftretch, where it has been expofed to the eye by the river, it is 

 fomewhat curved, and prefents its convex fide to the mountains. 

 To this bed of whin fucceeds a narrow ftratum of Argillite, per- 

 fectly fimilar to that which I have juft now defcribed upon its 

 fouthern fide. To this fucceeds a feam of Limeftone, fix feet 

 broad. This limeftone is of a pale blue colour, and is much in- 

 terfered by fmall veins of quartz trending through it in all di- 

 rections. 



In this limeftone, I was unable to trace the remains of any 

 animal or vegetable production. Its pofition is vertical, and it 

 is immediately fucceeded by another narrow ftratum of argillite, 

 thinly lamellated. 



To this narrow ftratum of argillite fucceeds a bed of Whin, 

 £eventy-five feet broad. This whin is, in its texture, more com- 

 pact ; and its fracture difplays a fmoother furface than either 



of 



