820 



J. GEIKIE ON THE GLACIAL PHENOMENA 



ridge, jun. I also describe in detail the glacial phenomena of Harris 

 and the other islands of the Outer Hebrides, which I traversed in 

 the course of the past summer in company with my colleague, Mr. 

 S. B. J. Skertchley. As all the islands have much in common from 

 a glacialist's point of view, it is hardly necessary for my purpose that 

 each should be described with equal detail. I have therefore selected 

 Harris for more minute treatment than the others, as it may be con- 

 sidered typical of all ; but as the evidence upon which my conclu- 

 sions are based derives much of its strength from its cumulative 

 character, it has not been possible to avoid giving a more or less 

 particular account of each island visited. 



II. Lewis * (Additional Notes). 



1. Geological Structure. — In my first paper descriptive of the 

 Outer Hebrides I stated that although the gneiss of Lewis had a 

 prevalent N.E. and S.W. strike, yet that direction was frequently 

 changed. I ought to have mentioned that the N.E. and S.W. strike 

 occurs chiefly in the east and central portions of Lewis. Thus it is 

 well shown in the Eye Peninsula, where the gneiss, capped uncon- 

 formably with Cambrian conglomerate, dips at a high angle to S.E.f 



* For the spelling of place-names in Lewis I have in this and the preceding 

 paper followed the maps of the Ordnance Survey. For the Gaelic orthography 

 of the place-names in Harris and the islands to the south I am indebted to my 

 friend Mr. Alex. Carmichael, of Creagorry, Benbecula. Mr. Carmichael has 

 been good enough also to write out the words as they are pronounced. I have 

 not thought it necessary, however, save in a few cases, to give the pronunciation 

 along with the Gaelic word ; but a few examples may be given here : — 



Eoinebhal, pronounced Eoineval. 



Langabhat „ Langavat. 



Abhuinn ,, Auin. 



Kudh „ Eu. 



Ceilegreihd „ Keilegrey. 



Theorabhag „ Theoravag. 



Aisgernis „ Aiskemish. 



t Having been asked by several geologists whether I may not have been mis- 

 taken as to this dip, which is at right angles to that given by Murchison, I may 

 state here that the bedding of the gneiss is extremely well seen in the coasts of 

 the Eye Peninsula, and that there cannot be any doubt whatever about the dip, 

 which is just as apparent as the dip of the overlying Cambrian strata, as will be 

 seen in the annexed sketch, which represents a part of the coast-section half a 



■fig* !• — Cambrian Conglomerate overlying Laurentian Gneiss, near Chicken 

 Head, Lewis. 

 N.W. __-__ S.E. 



a. Laurentian 

 Gneiss. 



mile north of Chicken Head. I may just remind geologists that the Cambrian 

 strata occur only in the east of Lewis, and are restricted to a limited area in the 

 neighbourhood of Stornoway. 



