MINERALOGY OF THE OCHILS. 17 



the clinkstone. Between Dunning * and the Yetts 

 of Muckhart, it occurs frequently above the clink- 

 stone, and below felspar-porphyry ; but is seen in 

 greatest abundance, variety, beauty, and distinct- 

 ness between the Yetts of Muckhart and the 

 western extremity of the Ochils, particularly in 

 an exposure made by a streamlet which divides 

 the King's Seat from Craiginnan f , and in a sec- 

 tion above the village of Westertoun. In this dis- 

 trict, it forms separate hills, or their caps, and in 

 the central parts of the group, it alternates dis- 

 tinctly stratified with the basaltic clinkstone, which 

 it connects with the felspar rock through the fel- 

 spar porphyry. The section above Westertoun, 

 may be considered a beautiful epitome of these 

 alternations, and it receives an additional interest 

 from its exhibiting a fine view of the junctions 

 of the Coal-field, with the newer rocks. The 

 beds of greenstone have a dip and direction at 

 right angles, to the dip and direction of the clink- 

 stone, from which it is separated by thin seams of 



* The observation made on the hills between Abernethy and 

 tCinross, applies to those of the above portion of the Ochil Hills. 

 The confusion arising from a perpetual repetition of names, has 

 induced me, in many instances, to omit them altogether. 



t Craiginnan is the hill which rises immediatly behind Dol- 

 lar, and is connected by a series of conical hills with the ro- 

 mantic and precipitous Craig Rossie, which rises to the west=^ 

 ward of the village of Dunning in Perthshire. 

 VOL. IT. B 



