164 THE GLEN OECHY ANTICLINE. [June I912. 



9. The Glen Okcht Anticline (Aegyllshire). By Edwaed 

 Batteesby Bailey, B.A., E.G.S., and Mjieeay Macgeegoe, 

 M.A., B.Se. (Read February 28th, 1912.) 



[Plate X— Map.] 



Contents. 



Page 



I. Introduction . 164 



II. History of Research 166 



III. Tectonics 167 



(A) TJie Beinn Udlaidh ^ Fold 167 



(B) The Loch Dochard Fold 172 



(C) Bocks overlying those of the Beinn 



Udlaidh and Loch Dochard Folds . 172 



(D) The Beinn Doirean Inversion 177 



IV. Difficulties 177 



V. Bibliography 178 



I. Inteoduction. 



In a previous paper [1, p. 586] ^ an explanation has been offered of 

 the tectonics of the schists occupying a district of the West High- 

 lands between Loch Tulla and Appin, in the south, and the Eiver 

 Spean, beyond Ben Nevis, in the north (fig. 1). In the present 

 paper the south-eastern continuation of this district is dealt with, 

 from the head of Loch Awe to Beinn Achallader, one of the summits 

 of the Beinn Doirean range (PL X). In the district originally 

 described lying to the west and north of Loch Tulla the following 

 stratigraphical sequence was established; but, whether it should be 

 read upwards or downwards, is still unascertained : — 



9. Eilde Flags. 



8. Glen Coe Quartzite (fine-grained). 



7. Leven Schists (grey phyllites, with ' Banded Series ' next the 



Glen Coe Quartzite). 

 6. Ballachulish Limestone (dark grey, with a thick cream-coloured 



margin next the Leven Schists), 

 5. Ballachnlish Slates (black). 

 4. Appin Quartzite (pebbly). 



3. Appin Limestone (cream, pink, or very pale blue). 

 2. Appin Pbyllites (with a large proportion of flaggy quartzite). 

 1. Cuil Bay Slates (black). 



These rock-groups, as previously shown, are disposed in two 

 major recumbent folds, known as the Ballachulish and Appin Folds 

 respectively, to which may be added the subordinate Aonach Beag 

 Fold, recognized as yet in the neighbourhood of Ben Nevis only. 

 For convenience of description, the cores of these three folds have 

 been arbitrarily defined as those portions which are made up of 



1 Pronounced approximately Ben Oodly. 



2 Eeferences in square brackets are to the Bibliograph 



y, §v,p. 1 



