Reviews—Geology of North-West Highlands of Scotland. 521 
V.—Memorrs oF THE GrotocicaL SurvEY oF GREAT Brirain. 
Memorr or tae Grotocican Srructure or tHE Nortu-Wesr Hieunanps 
oF Scorranp. By B. N. Peacu, LL.D., F.R.S., Joan Horne, LL.D., 
F.R.S., the late W. Gunn, C. T. Croven, M.A., F.G.S., and L. W. 
Hiyxmayn, B.A.; with Petrological Chapters and Notes by J. J. H. 
Tratt, M.A., D.Sc., F.R.S.. Edited by Sir Arcureatp GeErKrIE, 
K.C.B., D.C.L., Sec. R.S. Edinburgh, W. & A. K. Johnston, 
Ltd.; Glasgow, Jas. Hedderwick & Sons, Ltd. 8vo; pp. xviii 
and 670, with 52 plates and a geological map of the North-West 
Highlands of Scotland, and 66 figures in text. Price 10s. 6d. 
(Preliminary notice.) 
fV\HIS memoir, on the geological structure of the North-West 
Highlands of Scotland, is one of the most important which has 
been issued by the Geological Survey, as it relates to a region which 
has become classic for the study of the more powerful movements 
whereby the earth’s crust has been affected. 
The opening chapter gives a brief account of the various rock- 
groups to be found in that region, their geological relations, and the 
remarkable structures which they present in the field. It is followed 
by a historical account of the development of the research, special 
reference being made to the controversy between Sir R. I. Murchison 
and Prof. Nicol regarding the structure of the North-West Highlands, 
and to the investigations “which led to a settlement of the dispute. 
A detailed account is given of the structure, distribution, and 
petrography of the Lewisian Gneiss and Torridon Sandstone along the 
western portions of the counties of Sutherland and Ross. The various 
subdivisions of the Cambrian formation are enumerated, and, for the 
first time, a description is furnished of the distribution and organic 
contents of the Olenellus zone, which has been detected and traced by 
the Geological Survey for 100 miles. 
But the feature which renders the volume of exceptional interest 
to geologists all over the world is the description and illustration of 
those great displacements of the earth’s crust, whereby slices of the 
older rocks have been driven westwards for miles and made to rest on 
younger strata. The detailed evidence in proof of such movements is 
set forth in part iv. 
The concluding section of the work (part v) gives a brief account of 
the petrography, distribution, and geological relations of the Eastern 
Schists, which lie above the most easterly of the great planes of dis- 
ruption in that region. The age of those crystalline schists is still 
unsolved. 
The volume is illustrated by 52 plates, 66 text-figures, and a colour- 
printed geological map of the area between the north coast of Suther- 
land and Sleat in Skye on the scale of four miles to one inch. 
Copies may be obtained from any agents for the sale of Ordnance 
Survey maps, or through Messrs. Dulau & Co., 37, Soho Square, W., 
from the Ordnance Survey Office, Southampton. Price 10s. 6d. 
(postage 10d. additional). 
A full review of this important work will appear in next month’s 
GrotocicaL MacazIne. 
