180 



PROCEEDINGS 



OF 



THE GEOLOGICAL SOCIETY. 



POSTPONED PAPER. 



On the Geological Structure of the Southern Grampians. By 

 James Nicol, F.R.S.E., F.G.S., Professor of Natural History in the 

 University of Aberdeen. 



[Bead June 18, 1862*.] 



Contents. 



1. Introduction. 



2. Object of the Paper. 



3. Clay-slate Formation of Bute. 



4. Loch Long and Gareloch. 



5. Loch Lomond. 



6. Callander and Pass of Leny. 



7. Leny Limestones. 



8. Ben Ledi. 



9. General remarks on the foregoing 



Sections. 



10. Comrie and Strath Earn. 



11. Bedding or Cleavage (?). 



12. Mica-slate of Loch Earn. 



13. Dunkeld and Blairgowrie. 



14. Relation of the Old Red Sandstone. 



15. Clay-slate and Mica -slate. 



16. Central Gneiss and Quartzite. 



17. Tyndrum and Black Mount, 



18. Glen Shee and Braemar. 



19. Clay-slate of Loch Creran. 



20. Loch Leven and Glencoe. 



21. Fort William and Ben Nevis. 



22. Glen Spean. 



23. Geological connexion of the 



Grampians with other parts of 

 the Highlands. 



1. Introduction. — The nature and origin of the crystalline or me- 

 tamorphic strata have recently formed the subject of various memoirs, 

 both in this country and abroad. Living in a region in great part 

 composed of these rocks, and having for many years been engaged 

 in examining them in various parts of Scotland, I have naturally 

 taken much interest in these discussions. I now venture to lay 

 before the Society an account of some sections which I have recently 

 examined (several of them not for the first time), as they appear to 

 me to throw light on some points of high importance both in the 

 history of the earth and the structure of our own country. 



Before noticing special sections, it is right to mention that I have 

 long held the view of the metamorphic origin of these so-called pri- 



* For the other communications read at this Evening-meeting, see Quart. 

 Journ. Geol. Soc. vol. xviii. p. 378. 



