METAMOEFHIC AND OVERLYING EOCKS OF EOSS AND INVEENESS. 141 



11. On the Meta-moephic and overlying Rocks in parts of Boss 

 and Inveeness Shiees. ByHENEY Hicks, M.D., F.G.S. With 

 Notes on the Microscopic Structure of some of the Rocks by Pro- 

 fessor T. G. Bonney, M.A., F.R.S., Sec.G.S. (Read February 7, 



1883.) 



(Plate VI.) 



Contents. 



1. Introduction. 



2. Upper part of Glen Logan. 



3. Neighbourhood of Achnasheen. 



4. Ben Eay and Loch Clare to Glen Carron. 



5. Achnashellach, Loch Doule and Strathcarron. 



6. Loch Kisborn to Loch Carron. 



7. Attadale, Loch Carron. 



8. Strome Ferry and Loch-Alsh Promontory. 



9. Loch Shiel to Caledonian Canal. 

 10. Conclusions. 



1. Introduction. 

 Since I communicated my paper to the Geological Society in 1878, 

 on the rocks in the neighbourhood of Loch Maree, Ross-shire, I have 

 revisited the north-west Highlands on two occasions, viz. in the 

 spring of 1880, and in the spring of last year. During these visits 

 1 devoted my time to the examination, in various areas, of sections 

 which seemed likely to furnish evidence confirmatory or otherwise 

 of the views which I had ventured to lay before the Society. In 

 this paper I propose to give the general results obtained from these 

 examinations, and to treat more fully those sections which appear 

 to offer any conclusive evidence. In each of the areas examined I 

 made large collections of rock-specimens ; and numerous thin sections 

 for examination with the microscope have been made from these 

 rocks, and submitted for special examination to Prof. T. G. Bonney, 

 and Mr. T. Davies. The former has kindly furnished the notes on 

 these sections which are appended to this paper ; and to both, on 

 this as on so many former occasions, I am indebted for most valuable 

 assistance in the penological work. The notes by Mr. Davies in 

 the paper I published in the Geological Magazine in 1880, on the 

 Gairloch and Ben Fyn districts, have also so important a bearing on 

 the questions discussed in this paper that I shall find it necessary to 

 refer frequently to them. 



The notes in that paper on the Gairloch specimens are particularly 

 important, as they prove clearly the presence in that western area 

 of rocks which cannot be differentiated from many rocks in the 

 eastern area of Ben Fyn, included by Murchison, Geikie, and others 

 in the so-called newer gneiss of Silurian age. This group of Ben Fyn 

 is in this paper taken as the type to which is referred the newer series 

 of metamorphic rocks of Pre-Cambrian age in these areas as distin- 

 guished from an older, or Loch-Shiel series, and the supposed still 

 older Loch-Maree series. 



