10 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 horn{tone, 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 fades. In other 
places, the ftratified matter confifts of a {tone of a-laminated tex- 
ture, with undulating lamelle 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. 
Tuis argillite is fucceeded by a bed of Whin, thirty-three feet 
broad. This whin is of a dark blackifh-brown colour, and is of 
a more compact texture, than the whin which I have defcribed 
occurring in the grit, and is pofleffed of more induration: the 
materials of compofition are nearly the fame in both. 
Irs general ftretch 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- 
fe@tly 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 ofa pale blue colour, and is much in- 
terfected by {mall veins of quartz trending through it in all db 
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, 
feventy-five feet broad. This whin is, in its texture, more com- 
pact ; and. its fracture. difplays a fmoother furface than either 
of 
