﻿131 



MR. E. BATTERSBT BAILEY OF 



[vol. Ixxii, 



interested in Highland geology. For my own part, I found their 

 maps and memoirs indispensable for the study of the district in a 

 limited time. [As originally presented, my paper contained 

 a historical introduction, tracing the progress of research from 

 Macculloch's days onward ; but this has been withdrawn, as I am 

 advised that it is unnecessary in view of the information already 

 supplied in the Geological Survey Memoirs. 1 ] 



I may now briefly indicate my own connexion with the district. 

 In 1902 I had the extreme good fortune to receive my Survey 

 training from Dr. Peach, who was at that time engaged upon the 

 investigation of Scarba and the neighbouring islands to the north. 

 The delight of the experience I shall never forget. 



In 1907, the year which saw the publication of the Islay 

 Memoir, Mr. W. B. Wright and I were sent to map Colonsay. 

 We were supplied with advance proofs of the Islay Memoir and 

 with the original field-maps, and were instructed to visit the Rhinns 

 in order to acquaint ourselves with its geological structure and 

 succession, because Dr. Peach and Mr. Wilkinson had already 

 established a close connexion between Colonsay and this part of 

 Islay. After a few days spent officially in the Rhinns. we took 

 holidays and separated— Mr. Wright to study the raised beaches, 

 and I, on Dr. Peach's advice, to familiarize myself with the rocks 

 overhying the Loch Skerrols Thrust. I made a complete tour of 

 the coast-sections and many of the inland exposures. As a result, 

 I realized the necessity for modifying the views set forth in the 

 Memoir along the lines indicated in the present paper. I wrote 

 down my conclusions, but deferred publication until I could return 

 to the island and satisfy myself in sufficient detail as to the nature 

 of the faulted western limb of the Iskiy Anticline north of Bridg- 

 end. As chances afforded, I added to my observations in succeeding 

 years, but did not obtain a satisfactory opportunity to work out 

 this pai-ticular feature of interest until I took a holiday in the 

 island in 1913. At this time I also revisited the Rhinns, in order 

 to assure myself that the Lewisian Gneiss does really pass below 

 the Torridonian on the north, and is not affected by large-scale 

 inversion. 



But to return to the year 1907. I had other districts to visit 

 before following Mr. Wright to Colonsay, and by the time I arrived 

 he had already determined the major features of the geology. Not 

 long afterwards he made the interesting discovery of two earth- 

 movements affecting the cleaved sediments of the island. An 

 account of his researches in this direction is published in the 

 Journal of this Society and in the Geological Survey Memoir 

 dealing with Colonsay. 



In 1908 I officially revisited Shuna in company with Mr. Maufe, 

 and we found it impossible to agree with Dr. Peach's view that 

 the Degnish Limestone is separated from the Ardrishaig Phyllites 



1 Sections 1 and 2 of the Detailed Descriptions, which follow, have also 

 been recast. 



