P. MACNAIR ON ROCKS OF HIGHLAND PERTHSHIRE. 
177 
Table of the Altered Clastic Rocks of the Southern Highlands 
OF Scotland. 
ZONE. 
ROCKS. 
LOCALITIES. 
Upper 
Arenaceous 
Zone. 
Limestones. 
Quartzites. 
Glen Tilt, Blair-Atholl. 
Glenlyon, Schiehallion, Ben-y-Ghloe. 
Upper 
Argillaceous 
Zone. 
Graphite Schist. 
Sericite Schist. 
Quartzitesand Grey wackes, 
with Annelid Tubes. 
Ben Lawers, Glenshee. 
Loch Fyne, Ridge north of Loch Tay. 
Craig na Chailleich, Ben Lawers, 
Killin. 
Middle 
Arenaceous 
Zone. 
Garnetiferous Quartz-schists 
and Mica-schists, with 
bands of Grit and Con¬ 
glomerate. 
Loch Tay, Loch Earn, Glen Dochart, 
Balquhidder. 
Loch Tay 
Limestone 
Zone. 
Pure Limestone and Mica¬ 
ceous Limestone. 
Loch Tay, Loch Earn, Glen Dochart, 
Ashintully. 
Middle 
Arenaceous 
Zone. 
Garnetiferous Quartz-schists 
and Mica-schists with 
bands of Grit and Con¬ 
glomerate. 
Loch Tay, Loch Earn, Glen Dochart, 
Balquhidder. 
Lower 
Arenaceous 
Zone. 
Massive Grits and Con¬ 
glomerates. 
Grits, Greywackes, and 
Quartzites. 
Ben Ledi, Ben Vorlich. 
Pass of Leny, Glen Lednock, Forneth. 
Lower 
Argillaceous 
Zone. 
Clay-slates and Phyllites. 
Limestone. 
Graphite Shale, Red and 
Purple Shale. 
Aberfoyle, Loch Lubnaig, Pass of 
Kilmahog, Pass of Leny. [Leny. 
Kilmahog, Pass of Leny. 
In the paper just referred to, the principal lithological features 
and the geographical distribution of each zone are first given, and 
then a series of sections illustrating the structure and succession of 
these rocks as seen in Highland Perthshire. I may here mention 
that, at the time the paper was written, I was under the impression 
that Mr. Peach’s discovery of radiolaria amongst the cherts of the 
southern Grampians in association with black graphitic shales referred 
to my upper argillaceous group, and I concluded that there might 
be a succession from the quartzites with annelid tubes (possibly on 
the same horizon as those of the north-west of Scotland) up into 
those black schists and shales of Arenig age. Since then I have 
learned that this bed was found in my lower argillaceous series, 
namely, in the lower reaches of the valley of the Esk, and con¬ 
sequently such a succession has to be abandoned, unless the theory 
to be afterwards given should prove to be correct. 
