30 An Account of the Great TDcrlyshire Denudation. 



eastern fault or side of this first raised tract is not visible 

 within ihc limits of my Survey, like the soutlicrn, on ac- 

 count of the vast accumulation of quartz gravel in Sher- 

 wood Forest, and the peaty alluvia north of it : but it 

 seems probable to me, that its range is from about the 

 town of Nottiniihani, cast of Mansfield, east of Worksop 

 near Bautiy, west of Thome in Yorkshire, and how much 

 further north this fault proceeds, bel'ore it turns to the west, 

 I am unable lo state from my own observations; but from 

 the correspondence of my friend William Smithson, esq. 

 of Heath Hail near Wakefield, a verv able observer, 1 con- 

 clude, that the boundary fauft 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 

 tiie great Derbyshire and Yorkshire coal-field to the north, 

 and continues S. of Odey and Keighley* near Colne in 

 Lancashire and Ciitheroe, boundnig still the coal-field of 

 Lancashire to the north. 1 am not sufficiently acquainted 

 with the Lancashire strata to hazard a conjecture, as to 

 where this fault turns (or branches perhaps) towards the 

 southward again ; but on the west it probably passes not 

 far from Mancliester, Stockport in Cheshire, Macclesfield, 

 Congleton, Church-Lawton Salt-works, and joins the great 

 Derbyshire fault, or southern boundary of this very large 

 raised tract, somewhere to the N.W. of Stone in Stafford- 

 shire, as I judge, froni the information which I have re- 

 ceived, of the red marl occupying the surface withoutsidc 

 tiiis raised tract to the westward, in Cheshire and Stafford- 

 shire, as well as souih of it in Stafiordshiie, Derbyshire, 

 and Nottinghamshire, as above mentioned, and on the east 

 of it from Nottingham to Thorne in Yorkshire, and per- 

 haps further northward. 



This border, or plain of red marl, has the tract within it 

 so raised, that the yellow, or magnesian lime rock, proba- 

 bly abuts against the marl at the surface of the strata on 



* It seems probable, from the accounts which I have received from Mr. 

 Smithson, of the many small coal-haslns, or swjlleys, as they are called, 

 which occur iu the s])ace Ijetweeu Keighley, Hawes, and Richmond, viz. on 

 the N. side of Keighley ; on Founton" Fell in Craven ; Thorpe Fell near 

 Burnsall, Thresiiiield near Linton, and Anter-Heights near Kettlewell, oa 

 the Wharf river; Nethcrd<.ie Forest near Middlesmoor, on the Nidd river; 

 Slapestones near Hawes, West-Scrafton S. W. Leyburn N.W. and Braithwait- 

 Bank near to Middleham on the Yore river; HudswcU Moor S.W. 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. Westganh Forster's 

 " Treatise on a Section o" Strata," lately published, wherein near 1100 feet 

 thick of strata are described in order. 



the 



