222 Dr. Mac Cull och on the Hill of Kinnoul. 



CreifF, Tillycoultry, Callander, Aberfoyle, Drymen, and other 

 almost nameless places to the westward, marks the range of this 

 breccia, leaving on the north side all those rocks distinguished by 

 the name of primary, with many of those which bear the name of 

 transition^ and being followed to a certain distance southward by the 

 usual series of sandstones and other secondary strata. In the mid- 

 dle of this secondary tract arises the hill of Kinnoul, forming the 

 westernmost part of a long irregular ridge which extends from the 

 north of Dundee to Perth, where it terminates. Through part of 

 this course it exhibits an abrupt elevation to the south, subsiding 

 northward by a more gentle declivity into the great plain of Stor- 

 mont and Strathmore. Its visible boundary to the south is the allu- 

 vial plain of Gowrie, while to the north the red sandstone and that 

 breccia which accompanies or precedes the sandstone, form the only 

 rock for a distance of many miles, till we arrive at the mountain 

 schistus. I am not acquainted with the connection of this ridge at 

 its eastern end. 



The height of Kinnoul, (that part of the ridge which I purpose 

 to describe) is 600 feet above the plain of the Tay, and it occupies 

 a length of a mile or thereabouts, exhibiting many abrupt faces in 

 a state of constant ruin and degradation, which have thus formed 

 a rapid slope at the feet of the precipices. 



The rock itself contains many of the most remarkable varieties 

 belonging to the tribe. It will be sufficient to give a general des- 

 cription of them, as no purpose could be served by an attempt to 

 define rigidly either the spaces which they respectively occupy, or 

 the order which they follow, circumstances which are subject to 

 such variations as to obey no general rules. In some places a black 

 basalt may be observed, but it is every where amorphous and ap- 

 proaches here and there to the most ordinary kinds of compact 



