66 A DESCRIPTION OF THE [Ch. V. 



2. Greenish grey clay-slate - - 48 feet. 



3. Granite, and some clay- slate - - 66 



4. Greenish-grey clay-slate - - - 894 



5. Granite - - 96 



6. Clay-slate and granite in repeated alternations: 



the former sometimes containing large grains 

 of translucent quartz, and occasionally, also, a 

 few crystals of glassy felspar - - 1 92 



7. Granite .... 960 



8. Greenish-grey clay-slate - - 90 



9. Granite - - - 126 



10. Clay-slate, greenstone, and greenstone-slate, 



in alternation - - - - 120 



11. Ash-grey clay-slate, with some small beds of 



greenstone and greenstone- slate towards the 

 latter part - - - 666 



12. Ash-grey clay-slate - - 528 



1 3. Greenstone ; constituting the body of the hill 



at its junction with the northern arm. 



" This greenstone, examined by the lens, is seen to consist 

 of minute crystals of yellowish-grey felspar, intimately mixed 

 with spots of black hornblende ; its aspect to the naked eye, 

 being greenish or bluish-grey, with a compact, small-grained, 

 and uneven fracture. The compact greenstone, near the 

 clay-slate, acquires a fissile texture."* 



Again, " in the line of the Avonbeg, on the side of the mail- 

 coach road, may be seen repeated alternations. The beds in 

 the clay-slate, at first view, seem to be granular felspar ; but 

 a closer examination shows that they mostly consist of a fine- 

 grained granite; the three constituents of which are, in 

 some places, distinctly discernible. The alternation is as 

 follows : 



1. Granite - 4 feet wide, 



2. Clay-slate - - 36 



* Geol. Trans , vol. v. p. 172. 



