Reviews — Geological Survey of Canada. 137 
provisionally referred to the following groups :—felsites, syenites 
and schists to the pre-Cambrian; igneous rocks cutting Lower 
Cambro-Silurian conglomerates; volcanic rocks contemporaneous 
with Middle and Upper Cambro-Silurian. Dykes cutting through 
Silurian, Middle, and Upper Devonian strata, and volcanic rocks 
contemporaneous with Middle Devonian. Finally the Carboniferous 
conglomerate is traversed by volcanic rocks and dykes of contempo- 
raneous origin. 
Several pages of this report are devoted to an account of the 
surface geology, scenery, climate, agriculture, and economic minerals, 
of the district explored. The latter include coal, iron, gold, gypsum, 
phosphate of lime, building stones, etc. 
Mr. HK. BR. Faribault reports (pp. 129 P-165 P) npon the Lower 
Cambrian rocks of Guysborough and Halifax counties, Nova Scotia, 
including the gold-bearing slates and quartzites, “which cover 
nearly one-half the superficies of the Province, that is, according to 
various authorities, from 6000 to 7000 square miles.” 
A further contribution by Dr. G. M. Dawson (pp. 1 R-62 R) is 
supplied to the volume under review in the shape of “Notes to 
accompany a geological map of the northern portion of the 
Dominion of Canada, east of the Rocky Mountains.” The map is 
“designed primarily as a supplement to the general geological 
map of the southern portion of the Dominion, published by the 
Geological Survey in 1884, for the compilation of the western part 
of which the writer [ Dr. Dawson] was largely responsible.” 
The “notes” accompanying the map form a succinct account of 
the geology of the most northerly part of the continent, embracing 
the Arctic regions. ‘The information concerning these lands is 
derived from many scattered sources, including the well-known 
works of voyagers in the polar seas from Ross to Nares, and Greely. 
A very full bibliography of Arctic travel is appended to the “notes.” 
The prevailing rocks of these northern lands are Archean, and 
they probably form the greater part of Greenland, and “ doubtless 
underlie, at no great depth, the entire Arctic Archipelago.” The 
different subdivisions of the Archean occurring in the more 
southerly portions of Canada are repeated in the north; amongst 
these the Huronian is met with on the west coast of Greenland, 
probably on the Labrador coast, and on the west coast of Hudson’s 
Bay. Rocks of similar character to those of the Keewenaw or 
Animikie of the Lake Superior region, have been recognized in the 
vicinity of the Coppermine River, and are probably of Lower 
Cambrian age. This formation is of such wide extent that Dr. 
Dawson considers that it ranks as “one of the most important 
geological features of North America.” It is composed largely of 
volcanic rocks, and is apparently everywhere unconformable to the 
underlying Laurentian and Huronian systems. The Silurian and 
Cambrian systems, which are also widely developed, consist chiefly 
of “pale limestones, often of a yellowish or cream colour, and 
frequently more or less dolomitic. They rest everywhere uncon- 
formably on the Archean or on the Cambrian rocks.” The extent 
