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CRUISE IN LOCH FYNE, JUNE, 1899. 377 
On the Clyde this fault is seen at Toward, Kilcreggan, Rosneath, 
and Ardencaple, and it was crossed near Callander on the Society’s 
excursion on the Spring Holiday this year, and in the train on the 
excursion to Aberfoyle on 24th June. 
The outcrops of the various groups of strata along Loch Fyne run 
in the same direction as the anticlinal axis. The Geological Sur- 
vey Memoir (p. 85) gives the succession as follows, but we take it 
from the mouth of the loch upwards, the reverse of their order— 
1. “Albite schists, schistose greywackes, and other mica- 
schists.” 
2. Green-coloured schists mixed with schistose greywacke and 
other mica-schists. 
3. The Glendaruel or Loch Tay limestone, a coarsely-crystalline 
marble, and calcareous quartzite. 
4, “Alternations .of thin-banded mica-schists, commonly 
garnetiferous, with some limestones and ‘ green beds.’” 
5. “Graphite schists, dark graphitic limestones and quartzose 
schists intermixed with phyllitic garnetiferous schist.” 
6. Ardrishaig phyllites, soft calcareous sericite schists, with 
many outcrops of quartzite schist and some limestones. 
These groups represent a downward succession of strata, but 
which is the oldest and which the newest is not certainly ascer- 
tained. On the Loch Fyne side of the anticline the north-west 
rocks appear to be the newer, but on the Clyde side the south- 
west rocks seem to be the more recent. 
To Group No. 1 belong the first four islands which we visited— 
Sgat Mohr, Eilean Buidhe (buie), Eilean Buic, and Caisteal 
Aoidhe. We did not land on any part of the regions where the 
next two groups occur—namely, “the green beds” and 
the Loch Tay limestone. At the Society’s excursion to 
Killin, already mentioned, several sections of rocks near 
the head of Loch Tay, and in Glen Dochart, near the 
head of Glen Ogle, were examined, showing the Loch Tay 
limestone overlying hornblende schist. Regarding Cowal, Mr. 
Clough, in the Memoir (p. 45), says—‘“ The Glendaruel or Loch 
‘Tay limestone is perhaps the most readily mapped and _ best- 
defined schist in the district.” . . . ‘It is seldom seen without 
a band of hornblende schist either in or just at the sides of it, or 
in both positions.” 
