282 Wales not a primitive Country, 



In p. 187 Dr. G. mentions North Wales, as one, of the only 

 two situations in the main land of Englnnd {^owih Britain) where 

 primitive Rocks occur: Mr. Artliur Aikin, in y^ages 42, 65, 191, 

 J99, 202, 217, and 219 of his " Tour," ceitaiidy nientions these, 

 and in pages 99, 130, 209, 211, 214 and 215 speaks also of 

 Granite, among tlie minerals of the Principality, l believe how- 

 ever, from all I liavc seen, or could learn from others on the 

 subject, that in the latter case, Mr. Bakewell (p. 398, 2d Edit, 

 of his Geology) is right, in referring the granite mentioned, to 

 loose or alluvial Blocks : and in considering the former theoretic 

 deduction, to be quite unfounded: — if there be anything of con- 

 sistency or truth in the boasted Geognosy, the Copeland or Lake 

 Hills of Cumberland, ma^t surely be better entitled to the class 

 oi primitive, th:ui any part of Wales?: unless by the terms, " un- 

 associated by the nhler Rocks," Dr. G. means, wanting some- 

 thing older than Granite? — 'but, "Who shall decide, where 

 Doctors disagree ?." 



In charging me, towards the bottom of p. 187, with the " in- 

 nccuracy and confusion," of not knowing the relative age and 

 situation of the Red Marl, to be more recent, or above the Coal- 

 measures, Dr. G. forgets, that it was, for re-asserting this very 

 truth (which 1 had long before published), but which Professor 

 J. (as he says) had fondly persuaded him, he might appropriate 

 to himself, that he commenced his attacks nppon me-: " I 

 clearly see (says he) that it (the observation I had first genera- 

 lized) is of considerable importance," &:c. 



With whatever truth Dr. G. may ch^ge Dr. Kidd, and others 

 of his Geognostic brethren, with confounding the different Red 

 Marls, or the red-ground and red Sandstone (as he chuses to 

 call them, pages 184 and 188), he cannot fix this charge on 

 my friend Mr. David Mushett, p. 50 of your xlist volume, much 

 less on myself, who in the Phil. Trans, for 1811, or p. 29 of 

 your xxxixth vol. p. 105, vol. xxxixth p. 54, vol. xlii. and on 

 manv subsequent occasions, have spoken oi different red Marls; 

 all of them, alike, imbedding or passing locally, into sandstone, 

 and not therefore distinguishable from each other hy this cir- 

 cumstance. 



Dr. G. might here, have been aware, that something more 

 was wanting, than a reference, to " the truly admirable system 

 of Werner," or to any of its classes of formations or their mem- 

 bers, to overturn what 1 have observed and written, regarding the 

 Red Marl, and its locallv imbedded masses of Sienite, coarse 

 Slate, &c. in Leicestershire (not DerOy shire, as the Doctor 

 writes) : — when I may have examined the Malvern hills, I shall 

 be able, I trust, to speak of them less diffidently than in vol. i. 

 jjL, 152, andj if necessary, it shall be with more truth : — often as 



desGriptiot» 



