Reports & Proceedings—Edinburgh Geological Society. 47 
REPORTS AND PROCEEDINGS. 
ErINBuRGH GEOLOGICAL SOCIETY. 
November 17, 1920.—Mr. E. B. Bailey, M.C., B.A., F.G.8., F.R.S.E., 
President, in the Chair. 
“ Recent Advances in Highland Geology.” An Address by the 
President, Mr. E. B. Bailey, M.C., B.A., etc. 
There is good reason to believe that the rocks of the $.W. High- 
lands are assignable to three major structural divisions, which in 
descending order are as follows :— 
Loch Awe Nappe. 
Isltay Nappe. 
Ballappeil Foundation. 
The Loch Awe Nappe is only preserved in the heart of the Loch 
Awe Syncline. 
The Isltay Nappe outcrops in the Islay Archipelago and in the 
district reaching from Kintyre to Loch Tay. The connexion 
between these two outcrops is locally severed by the Ktive Granite. 
The Ballappeil Foundation emerges from beneath the Isltay 
Nappe in an extensive district ranging N.E. from Lismore and 
Glen Orchy. It takes its name from Ballachulish, Appin, and Loch 
Filde. 
The two lower structural divisions are themselves structural com- 
plexes. Thus a great recumbent fold has been recognized in Ben 
Lui within the limits of the Isltay Nappe. This Ben Lui Fold, with 
an associated thrust at the base of the overlying Loch Awe Nappe, 
leads to a marked contrast of the two flanks of the Loch Awe Syncline 
below the level of the Ardrishaig Phyllites. 
The Loch Awe and Isltay Nappes seem to have travelled into 
position from the N.W. The reverse movement, so well known in 
the N.W. Highlands, is, however, exemplified by later disturbances, 
including the Loch Skerrols Thrust of Islay. 
The interpretation of thé §.W. Highlands, as sketched above, has 
much in common with Clough’s reading of the Cowal district, which 
itself constitutes an important part of the region considered. 
LIVERPOOL GEOLOGICAL SOCIETY. 
November 9, 1920.—-W. T. Walker, Fsq., B.Sc., F.G.S., in the Chair. 
Paper: “A Contribution to the Microscopic Study of the 
Carboniferous Limestone of North Wales.” By T. A. Jones. 
The Carboniferous succession in North Wales is probably un- 
represented by any beds earlier than those of the Upper Seminula 
zone. The limestones are almost entirely of organic origin, and are 
built up of the remains of crinoids, corals, polyzoa, foraminifera, 
brachiopod and other shells, cemented by a varying amount of 
clear secondary calcite. Occasionally some of the beds consist 
