SECTIONAL TRANSACTIONS .—C. 305 
metamorphosed current-bedded arkoses are found among the Moines of 
Ardnamurchan. 
The retrogressive metamorphism of the Moines near the Moine Thrust 
did not carry the implication of a Pre-Cambrian age for the main Moine 
crystallisation, in the opinion of Peach, and the speaker agrees with this 
view. 
While Read’s interpretation of the Tarskavaig Moines, as being unusually 
highly metamorphosed Torridonian rocks, is consistent with Teall’s view, 
Clough was equally certain that they are unusually lowly metamorphosed 
Moines. 
Near Loch Borolan sheared sills, apparently belonging to the Assynt 
complex, are found on both sides of the Moine Thrust, which suggests that 
some of the sills were intruded after the Moine Flags had moved into the’ 
district. ‘Thus the intrusion of the Assynt complex cannot have entirely 
preceded the thrust movements. 
The appinite suite, referred to by Dr. Phemister, has been shown by 
Wright, in Colonsay, to be of intermediate age in relation to two suites of 
movements, both of which are presumably referable to the Moine Thrust 
series. 
Dr. R. CAMPBELL. 
Dr. GERTRUDE L. ELLes, M.B.E. 
In the extreme south-west of the area, the Tayvallich Boulder Bed contains 
boulders of Moine types of rock. The boulders of alkali-rich igneous 
rocks come in above, also a great series of highly metamorphosed schists and 
gneisses, closely resembling those of Islay. Quartzite boulders are also 
found, and the evidence of these included rocks points strongly to the 
conclusion that the Moines must be pre-Dalradian. 
Prof. P. E. Eskoia. 
The Moinian and Dalradian bear little resemblance to the metamorphosed 
Cambrian-Silurian of Scandinavia, but in both Sweden and Finland the 
Jotnian Sandstones are similar in every respect to the Torridonian, and 
almost certainly of the same age. In eastern and northern Finland the 
Karelian Zone of metamorphic rocks stands in the same relation to the 
Jotnian as the metamorphosed Cambro-Silurian of Scandinavia to the 
O.R.S. The Karelian Zone is closely comparable with the Dalradian, and 
includes quartzites, slates, mica-schists and limestones, cut by numerous 
sills and dykes of basic intrusives. Dr. Mikkola has recently mapped in the 
eastern and western parts of central Lapland sedimentary formations 
much like the Moinian, and probably older than the Karelian lying between 
the two areas. The plutonic intrusives in the Karelian are, however, 
Pre-Cambrian, and even Pre-Rapakivi in age, while those in the Scottish 
Highlands are Caledonian. It is consistent with the theory of geosynclines 
and recurrent periods of orogeny to suppose that sediments of similar 
lithological types may well have been deposited between the close of the 
Karelian and the Caledonian orogeny, as during the next older Pre-Cambrian 
orogenic period, i.e. up to the close of the Karelian. In Scandinavia the 
Eocambrian Sparagmite Group perhaps correlates with parts of the Dalradian, 
and it may be significant that the tillite of Varangerfjord, formerly regarded 
as Ordovician, has been recently shown by Holtedahl to be Eocambrian. 
The Boulder Bed at Schiehallion, with its interesting pebbles, is very like 
M 2 
