MINERALOGY OF THE REDHEAD. 367 



whicli I have described'^, as occurring in the 

 neighbourhood of Dundee, form a portion of this 

 district ; and the Hills of Kinnoul and MoncriefF, 

 near Perth, and the extensive range of the Ochils, 

 all belong to the same formation with the red 

 sandstone, and occupy a place in it in the form of 

 beds. 



The relations of the red sandstone of this dis- 

 trict, with the older and newer rocks, are very dis- 

 tinctly displayed. At its northern extremity. 

 Colonel Imrie, in his valuable section of the 

 Grampians from ^the plains of Kincardine to the 

 summit of Mount Battock, has traced its junction 

 with the transition rocks on which it rests. 

 At its southern extremity in Fifeshire and Clack- 

 manan, it is covered with the strata belonging to 

 the independent coal formation. This fact of the 

 red sandstone being the fundamental rock of the 

 coal-field of the Forth, was first pointed out to me 

 by a very intelligent observer, Mr R. Bald of Alloa, 

 with whom I had an opportunity of examining 

 that part of the OchilSj on which the Clackmanan 

 coal-field rests, in the month of September 1807* 

 I had previously been convinced, that the inde- 

 pendent coal formation was newer than the red 

 sandstone, from an examination of the coast of 

 Renfrew and Ayr, (May 1807,) as I observed a 



* Page 138. of this volume. 



