Red Sandstone plants, determined by Dr. Kidston as P~,,ilophyton and Pachytheca respectively, from a bed of black shale underlying the lavas on the northern face of Stob Dearg. Specimens of Psilophyton were also found in dark-grey shales and mudstones underlying the basic andesites on the north side of Glen Coe above Loch Achtriochtan. ~ Mr. Kynaston published brief summaries of his researches as they proceeded:; but his final, and in some instances modified, conclusions can only be found ill lhe manuscript notes left by him on his depart, ure for South Africa in 1903. In many directions little advance has been made from the position indicated in these notes. Thus Mr. Kynaston describes in detail the volcanic succession developed in Aonach Dubh and Bidean ham Bian, which, as will be seen later~ provides a typical section of the area. He a]so gives an account of the interesting boulders of granite, andesite, and quartz-porphyry in the basement conglomerate exposed on the hillside north of Loct~ Achtriochtan. Further, he accounted for the position of the rhyolites of Stob Dearg, or rather the absence of the Aonach Dubh andesites beneath them, by assuming an overlap of the rhyolites eastwards against an uneven floor of schists. And he even interpreted the vertical junction of the volcanic rocks with the schists in the Cam Glen as an extreme example of this unevenness. Here again we have followed Mr. Kynaston, after a careful consideration of all the evidence in the field. He also demonstrated that the Ben Cruachan granite is later than the Old Red volcanic rocks, since it invades and alters them ; and finally we may record that in An t-Sron, above Loch Aehtriochtan, he had begun mapping the boundary-fault of the Glen Coe cauldron. He had, in fact, realized, so far as was possible from a single section, the fundamental relation subsisting between this fault and the intrusive rock which so constantly accompanies it. We may illustrate this point by quoting his manuscript :-' On the south side of Glen Coe, south-southwest of Loeb Achtrioehtan, a well-marked line of fault, indicated by a deep cleft on the northeast slopes of An t-Sron, cuts off abruptly the basic andesites which are seen on the east side. On the west side occurs a mass of granite which shows a marginal facies along the line of the fault, so that it is possible that the fault may be older than the granite.' Our own connexion with the district dates from the years 1903 and 1904. a During 1903 Dr. Peach was still in charge, and did some mapping in the area himselL The time during which he was actually at work in the district was very brief, but the value of his influence will never be forgotten by those whom he introduced to the varied geological problems of Glen Coe.
