24$ Mr. Farey’s Accoiml of 
north this fault proceeds, before it turns to the west, I am 
unable to state from my own observations ; but from the cor- 
respondence of my friend William Smithson, Esq. of Heath 
Hall near Wakefield, a very able observer, I conclude, that 
the boundary fault on the north of the outer lifted tract, ranging 
not far from the lower part of the course of the Wharf river, 
suddenly cuts off, or terminates the great Derbyshire and 
Yorkshire coal-field to the north, and continues S. of Otley 
and Keighley * near Colne in Lancashire and Clitheroe, 
bounding still the coal-field of Lancashire to the north. I am 
not sufficiently acquainted with the Lancashire strata to hazard 
a conjecture, as to where this fault turns (or branches per- 
haps) towards the southward again ; but on the west it pro- 
bably passes not far from Manchester, Stockport in Cheshire, 
Macclesfield, Congleton, Church-La wton Salt-works, and joins 
the great Derbyshire fault, or southern boundary of this very 
large raised tract, somewhere to the NW. of Stone in Staf- 
fordshire, as I judge, from the information which I have re- 
ceived, of the red marie occupying the surface withoutside 
this raised tract to the westward, in Cheshire and Staffordshire, 
* It seems probable, from the accounts which I have received from Mr. Smithson, 
of the many small coal-basins, or swilleys, as they are called, which occur in the space 
between Keighley, Hawes, and Richmond, viz. on the N . side of Keighley ; on Fountain 
Fell in Craven; Thorpe Fell near Burnsall, Threshfield near Linton, and Anter- 
Heights near Kettlewell, on the Wharf river; Netherdale Forest near Middlesmoor, 
on the Nidd river; Slapestones near Hawes, West-Scrafton SW. Leyburn NW. and 
Braithwait-Bank near to Middleham on the Yore river ; Hudswell Moor SW. of Rich- 
mond on the Swale river. &c. that all these belong to the lower or calcareous part of 
the Newcastle coal series, as exhibited in Mr. Westgarth Forster’s “ Treatise 
pn a Section of Strata,” lately published, wherein near 4100 feet thick of strata ar? 
described in order. 
