ow Coal-measures, is not yet generally knoivn. 343 



respecting Garforth, Kippax, and Glass-Houghton Collieries ; 

 all which I think might have restrained the sarcastic jeers of 

 the ivell educated Mr. G. at practical Men, remaining long in 

 the dark, as to facts, that seem very plain, after being fully 

 known. 



It may be proper to add in this place, that not only the ma- 

 joritv, but nearly all or tiie local and operative Colliers in Eng- 

 land (and too many of their superiors) except some near Bath 

 and Bristol and near Bedworth, still doubt, and even deny the 

 ov^erlieing of the Red Marl or its Red Rock on Coal-measures, 

 either conformal)lv or otherwise, and that they generally assert, 

 either, as I have mentioned of the Ashby-de-la-Zouch Coal-field, 

 Derby Rep. i. 174'^, that a fault is always met with, before 

 reaching the edge of the Red Marl or Red Rock; or, that the 

 seam they have been working, rises suddenly up and bassets or 

 ^' is thrown out," before reaching such edge, or more commonly, 

 ihey say, that it is " cut oif," without being able to explain how; 

 and they mostly aver, that in no case do the Coals pass under 

 the Red Marl or Red Rock! These representations seem to have 

 been often made to Mr. Bakewel!, and have been and will, for a 

 lime at least, continue to be so repeated, to every inquirer. In 

 Durham, it should seem, that a similar notion yet prevails, and 

 was lately mentioned to Dr. Thomson and Mr. Bakewell (see 

 p. 177 of this volume), that the Coals never pass under the yel- 

 low Limestone ! 



In saying thus much, I ho]3e no one will consider me as cast- 

 ing reflections, as to the veracity or the designs of this body of 

 highly useful and respectable Men, far from it ; I have often had 

 the satisfaction of saying, that on matters oi Jact^ I rarely if 



* .Since my Report was printerl, ami since I have had any opportunity of 

 wTJfiuji on the subject of this Coal-lit!il, I have had numerous ami excellent 

 oppriitiuiitiesi)t'observin'j;an(l of study in;:; the efTectsot' Kidiics aiul rroiisiiis, 

 Bui.ps and lfr)IIows and yflier oriiiimil inequalities in t/ic planes and t/iick- 

 nesats '}!' strata, ttirousih which Faults hnvc suhsequentli/ broken; aud ain 

 now well convinced, tliut practica! Colliers are very often if not mostly 

 wrontj, when ihey refer the locally rapid dips they meet with, to or from a 

 fault, to a till of one or both of th;; piles of strata contii^uons to such fault, 

 an<l consider such tilts to be occasioned htj the Fault ; and that bein^ for-% 

 merly iniMulormed on these points, I liave involved niy ^'eneralization or 

 t/iriri/ of Faults, in its vWw.i diflienlly, that of the very tccd^'e-li/ie form of 

 the rault-stutfi Derby Hep. i. p. I'il): from which I could now clear it, and 

 render it applicable, perhajis to all the cases that really occur in the Collier's 

 prar'ti<;i>, if I had sufficient leisure or inducement to set about such awork: — 

 until then, I must continue to describe and repeat each case, where neces- 

 sary, ill my private or professional Reports on Collieries, instead of being 

 able to siiorteii them, by rf,-fcrejice to a published work, describing each 

 cube. 



Y 4 ever 



