284 REVIEWS 



The geology of Whiskey Lake and the Massey Copper Mine area is 

 reported upon by Dr. A. P. Coleman. The former workings were made 

 first for copper and later for gold. The latter district has been worked for 

 copper. Neither of the districts is commercially productive. 



With the addition of the District of Patricia, the province of Ontario 

 was given a location for a railway terminus at the mouth of Nelson River 

 within territory formerly included in Manitoba. The location and 

 surveying of this section are reported by Mr. J. B. Tyrrell. He describes 

 his reconnaissance observations upon the agricultural and geological 

 features of the parts of Patricia which he visited. In the northern part, 

 the ancient crystalline rocks are overlain by fossil-bearing Ordovician 

 and Silurian rocks. The Labradorean ice sheet deposited enough of a 

 till covering upon the bared rocks of the northern part of the region to 

 offer considerable agricultural possibilities. There are many instances 

 of rock scorings of two glacial sheets. These are the Patrician and the 

 Labradorean ice sheets. In Trout Lake region there is one set of striations 

 which runs north 25° to north 40° west, planed and grooved by a glacier 

 which moved south 40° west. The first striae were made by the Patri- 

 cian glacier, which had its center in the highland southeast of Trout 

 Lake; the later glaciation from the northeast was that of the Labrado- 

 rean ice sheet. Upon the Hayes River, Mr. Tyrrell found evidence of 

 the westward movement of the Patrician glacier followed by a southeast- 

 ward advance of the Keewatin glacier. He considers, therefore, that 

 the Patrician ice sheet preceded both the Labradorean and the Keewatin 

 invasions in this region. 



Mr. A. L. Parsons deals with the Lake of the Woods and other 

 mineral areas in northwestern Ontario. He gives a detailed description 

 of many of the ancient rocks of the region. A brecciated contact between 

 granite bosses and Keewatin rock is common. The explanation offered 

 is that the granite was intruded between the highly schistose layers of the 

 metamorphosed Keewatin rocks. In most of the massive Keewatin 

 rocks this contact breccia gives place to coarser, banded structure. 



The West Shining Tree Gold area is described by Mr. R. B. Stewart. 

 The rocks are chiefly of Keewatin age. The gold content is in quartz 

 veins. The veins are very irregular in size and persistence; they are 

 generally less than 4-6 feet wide and break into stringers. Many of the 

 veins contain visible gold. A large amount of gold has been deposited 

 along the fracture lines of the quartz, and a little in the bordering schists. 

 The district is only in the very first stages of development. 



