Mr G. S. Johnstone: Dr Treagus has shown a section eastwards from Kinlochleven through the Eilde Quartzite and into the Moines. Do the Moines there show any unusual lithologies? West of the Fort William Slide the rocks between it and the Great Glen include varieties of psammites, pelites and graphite schists, probably extending northeast towards Fort Augustus, whose affinities are as yet undefined. They could represent Moine rocks of unusual lithology or, possibly more likely, infolds of Dalradian strata. The absence of similar rocks from the less complex Moine area east of Kinlochleven would be significant in this respect.
The Author replied that the Moines to the east of Kinlochleven were typical 'Central Highland Granulites', showing the usual variations to more or less pure quartizites and pelites, but the latter never being notably graphitic. More promising correlatives for the Linnhe Dark Schist would seem to be the Eilde, Binnein and Leven Schists, all of which contain substantial graphitic horizons.
Dr J. L. Roberts congratulated the author on his careful mapping of an area of considerable structural complexity. The speaker confirmed that the downward facing structures mapped by Dr Treagus around Kinlochleven could be traced around the secondary Stob Bhan Synform to become upward facing in the Tom Meadhoin Anticline and the Appin Syncline. This zone of upward facing could be traced SW into Islay. From Islay these first phase structures fan through the vertical across the Loch Awe Syncline to the SE, beyond which they arched across the Gowal Antiform