L M 1 
XI. Proceedings of Learned Societies. 
GEOLOGICAL SOCIETY. 
[Continued from vol. xv. p. 437.] 
May 9, 1833.— J. W. Hulke, Esq., F.R.S., President, 
in the Chair. 
T^HE following communications were read : — 
-*- 1. "The A°;e of the newer Gneissic Rocks of the Northern High- 
lands.'" By C. Callaway, Esq., D.Sc, F.G.S. With Notes on the 
Litholoar of the specimens collected hy Prof. T. G. Bonnev, M.A., 
F.R.S., Sec. G.S. 
The object of the author was to prove that the eastern Gneiss of 
the Northern Highlands, iisually regarded as of " Lower Silurian " 
age, was to he placed in the Archaean. While admitting that this 
gneiss frequently overlies the quartzo-dolomitic group of Eribol and 
Assynt, he held that this relation was due to dislocation accompanied 
by powerful thrust from the east, which had squeezed both forma- 
tions into a series of folds thrown over towards the west, so as to 
cause a general easterly dip. As a prehminary to his demonstra- 
tion, the author gave the following classification of the quartzo- 
dolomitic series, which, in the absence of clear proof of its age, he 
called the "Assynt Group," the subdivisions being taken in ascend- 
ing order : — 
C,. Torridon Sandstone and Ben More Grit. 
C 2 . Quartzite. 
C 2 1. Seamy. C 2 u. Annelidan. 
C 3 . Brown Flags. 
C 4 . Salterella Grit and Quartzite. 
C_. Dolomite. 
C. 1. Dark. C 5 u. White. 
For the eastern gneiss the author proposed the term "Caledo- 
nian." 
Taking the country examined from south to north, Loch Broom 
was first described. Here the author considered there was clear 
proof of dislocation. Between the Torridon and the Caledonian 
there were several subparallel faults, which increased in throw from 
west to east, Torridon Sandstone being first brought up through the 
quartzite, then further east through the dolomite, while still further 
east the Hebridean was thrown up, the Caledonian appearing 
east of the Hebridean. This Hebridean was the " porphyry " of 
Nicol. 
In Assynt the " Upper Quartzite " was first discussed. The author 
described several sections which he considered to prove that this 
band was the ordinary quartzite repeated east of a great fault 
which brought up the Hebridian, in one place (Glen Coul) the 
