BUTE. GEOLOGY. 455 



the hills of Angus to the Clyde; passing through Dunkeld, 

 Crieff, Callander, Loch Lomond, and other points which it 

 is unnecessary to enumerate, through Bute ; where it is 

 indicated in the accompanying map of that island. This 

 place is the last in which it appears with that linear regu- 

 larity which it has so long preserved ; the direction being 

 perverted in Arran, although the series is there found, 

 by the circumstances already stated in the description 

 of that spot. 



Throughout the line now described, the micaceous schist 

 is not conterminous, as in Cantyre, with the red sand- 

 stone which occupies a parallel belt to the southward; 

 but is immediately followed by another primary series, 

 already noticed in Arran, and indicated in the map of 

 Bute ; where its true position, and its continuity with 

 the remainder of the same series in the mainland, are 

 preserved. The breadth of this belt of schistose rocks 

 varies in different parts of its course; being sometimes 

 extenuated to half a miJe or less ; in other places amount- 

 ing to, or even exceeding five miles. In all situations, 

 it follows the preceding series with a general conformity 

 of inclination ; and the linear direction of the beds is also 

 parallel to that of the whole belt, or to the general direc- 

 tion of the primary strata of the Highland division of 

 Scotland. Of both these divisions of primary rocks it 

 may be remarked, that the quantity of the dip is various, 

 but that the angles are generally high ; rarely subsiding 

 to thirty degrees, and often approaching the perpendicular. 

 The general description of the last belt of primary rocks, 

 will be terminated by remarking that it is immediately fol- 

 lowed, and generally in an unconformable position, by the 

 red sandstone ; as is also indicated in the map of Bute. 



It is unnecessary to detail the mineral characters of the 

 varieties which enter into the series of micaceous schist 

 along this tract, as it would transgress the bounds of 

 the present discussion. But it is proper to remind the 

 reader of that which was. formerly noticed, namely, that 



