120 Notices of Memoirs—Professor J. W. Gregory— 
conclusive that the Dalradians are resting on an eroded surface of the 
Moine Gneiss. The Dalradian System may be divided into five series 
as follows :— . 
Schiehallion Quartzite Series (including the Boulder Bed). 
Blair Atholl Series (Limestones, black schists and quartzites). 
Ben Lawers Series (Phyllites with some limestones and quartzites). 
Loch Tay Series (Limestones, garnetiferous mica schists and 
some quartzites). 
Loch Lomond Series (Gneiss, albite schist, etc.). 
The most important rock in the lowest series is the Loch Lomond 
Gneiss, which is well developed in the peninsula of Cowal, on both 
sides of the northern part of Loch Lomond, and around Loch Katrine. 
This series consists mainly of coarse, highly inclined sedimentary 
gneiss and albite schists. This series extends eastward to Loch Voil, 
where it disappears beneath the rocks of the Loch Tay Series to the 
north and the overlap of the Ben Ledi and Ben Vane Grits and slates 
to the south. North of the Loch Lomond Gneiss occurs a series of 
garnetiferous mica schists associated with limestones and some 
quartzites. This series can be traced all across the country; it 
includes the Glen Daruel limestone south of Loch Fyne, and the 
limestones of Crianlarich, Glen Lyon, and Loch Tay. That they 
overlie the Loch Lomond Series is well shown north of Loch Voil, 
and that they rest unconformably on the Moine Gneiss is proved by 
the evidence north of Ben Lui. The essential member of the Ben 
Lawers Series is the phyllite of Ardrishaig, the Forest of Mamlorn 
and Ben Lawers. This phyllite is often intensely crumpled and 
seamed with innumerable thin quartz veins. It is associated with 
thin bands of quartzite and quartz-schist. Its superposition on the 
Loch Tay series appears to be clearly demonstrated from the relations 
of the two series at Ben Lawers, and still more clearly from the 
outliers of the Ben Lawers phyllite resting upon garnetiferous mica 
schists, as at Ben nam Imirean. 
The Blair Atholl Series consists of the Blair Atholl Limestones, the 
black or graphitic schists and some interbedded quartzites, which are 
often of considerable thickness and form a large part of the Highland 
Quartzite. To separate them from the succeeding quartzite, it is 
proposed to call them the Cammock Hill Quartzite, from a locality 
where they are well exposed near Pitlochry. 
_ The uppermost member of the Dalradian System is the Schiehallion 
Quartzite with the boulder bed at its base. It rests unconformably 
upon the Blair Atholl Series. Parts of the quartzite are quite 
unfoliated and remain as granular felspathic quartzites, in which the 
felspar grains have not been sheared or crushed. 
According to this arrangement, the five series of the main Dalradian 
sequence occur in succession from south to north, and the oldest 
members are the most altered and highly crystalline. 
Along the southern margin of the Dalradian schists there is a series 
of slates and grits, which are not foliated, and strikingly resemble 
ordinary Paleozoic slates and quartzites. The slates are worked at 
Luss and Aberfoil. The field relations of these Aberfoil Slates and 
