Reviews — Geological Survey of Canada. 179 



metamorphic phase, and to these are added newer intrusions of 

 granite, which have changed the sedimentary Cambrian rocks 

 into schists and gneisses by the heat and pressure due to the 

 intrusion. The unaltered Cambrian rocks, represented by dolo- 

 mites, shales, and doloraitic sandstones resting unconformabiy upou' 

 Lanrentian gneisses, occur on the east coast of Hudson Bay, where 

 at Richmond Gulf they have a breadth of twenty miles. They are 

 traceable also up the Larch River for thirty miles from its junction 

 with the Kaniapiskau. Detailed sections showing the character of 

 the rocks were measured at various places, and these are inserted in 

 the Report, which concludes with a record of the superficial deposits 

 and glaciation of the region traversed. 



Dr. L. W. Bailey's report, which is accompanied by a coloured 

 map drawn on a scale of eight miles to one inch, treats of the 

 geology of South- West Nova Scotia, embracing the counties of 

 Queen's, Shelburne, Yarmouth, Digby, and part of Annapolis. 

 This area comprises 3,370 square miles, in which the following 

 groups of rocks are represented : — 



1. Granite. 



2. Quartzites and slates resembling those of Halifax and Lunenburg 



Counties, like them auriferous, and believed to be of Cambrian 

 age, but without ascertained fossils. 



3. Micaceous, hornblendic, and staurolitic strata, supposed to be the 



metamorphic equivalents of the Cambrian rocks. 



4. Fossiliferous slates and iron-ores of Oriskany or Eo-Devonian age. 



5. Red sandstones of Post-Carboniferous age — Triassio ? 



6. Trap (dolerite, amygdaloid, etc.), associated with No. 5. 



The physical features and surface deposits of the region surveyed 

 are next described; its iri'egular coastline, with long and narrow 

 inlets, whose resemblance to the fiords of Norway was pointed out 

 by Sir Charles Lyell on his first visit to America in 1841 ; the dunes 

 or sand-hills, moraines, boulders (often of large size), rivers and 

 lakes, kames, and peat bogs ; and the glaciation, very strongly 

 marked in the rocks upon the coast, forming in some places deep, 

 trough-like hollows. 



The underlying rocks, largely consisting of those provisionally 

 referred to the Cambrian, exhibit evidence of profound metamorphism 

 in some parts of the area, while in others they are but little altered ; 

 these two conditions passing into each other by insensible gradations. 

 They are separated by Dr. Bailey into three divisions : I, the 

 Quartzite Division ; II, the Banded Argillite Division, consisting of 

 grey and purple slates ; and III, the Black Slate Division. These 

 rocks have been affected by the earth movements which have in- 

 fluenced the rock formations along the whole eastern coast of America, 

 and present a series of domes or ridges, usually anticlinal in structure, 

 around which are enwrapped the remains of the higher and less 

 resisting slaty beds. The total area covered by the Cambrian rocks 

 in the district examined is computed at 1,000 square miles. 



Siluro-Devonian beds occur in small patches in Annapolis and 

 Digby Counties. It is concluded from the fossils derived from these 



