iO MINERALOGY OF THE OCHILS. 



having seen a different rock at a small height 

 above it, that it is inconsiderable* The basis of 

 this rock is a greyish- green clay stone, occasionally 

 very much ironshot. The numerous cavities con- 

 tained in it, are lined with white amethyst, flesh- 

 red calcareous spar, white felspar, chalcedony, red 

 flint, and common quartz. The chalcedony ap- 

 pears to have been first deposited, and the quartz 

 to have been the last. 



The amygdaloid sometimes becomes porphy- 

 rytic, containing crystals of felspar. 



It is difficult to assign to this rock its correct 

 geognostic position. At Parton Craigs, it is below 

 claystone porphyry. Near Newport, it alternates 

 with basaltic clinkstone. At the western extre- 

 mity of W ormit Bay, it is below the claystone, 

 through which it seems to be connected with the 

 tulF on the one hand, and with the claystone por- 

 phyry on the other. On the water of Fargs, 

 which runs from Damhead ^ to Abernethy, it oc- 

 curs resting on a variety of greenstone, which is 

 connected with the clinkstone. In this last situa- 

 tion, it possesses a great variety of characters, 

 being extremely coarse at one point, where a bed 

 of clay-porphyry rests upon it. More to the 

 southward, the vesicles in the amygdaloid become 



* This place is about half way between Kinross and Aberf 



wethy. 



