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A. P. Low abundant altered aplite aplite dikes appearance Archaean asbestos biotite calcite chalcopyrite character chlorite chlorite schist coal-field coarse colour D. B. Dowling deposits diabase diabase bodies Duncan lake East and West east shore Eastern Townships Elk Lake exposed extending feet feldspar fine-grained Firth lake formation G. M. Dawson geological Glacial gneiss Gowganda lake grained greywacke hills hornblende hornblende gneiss Huronian igneous intrusion J. B. Tyrrell Keewatin Kenisheong lake L. W. Bailey L'Africain Lake Timiskaming Laurentian mass Middle Huronian miles mineral Montreal River Montreal River district Mosher lake Obushkong lake occur olivine pebbles Pigeon lake plagioclase portage portion post-Huronian present quartz quartz diabase R. G. McConnell R. W. Ells region ridges rock scale 25 scale 40 ch schist sedimentary serpentine silver smaltite specimens stratiform structure Sudbury Sudbury district surface texture Timiskaming tion veins vertical Wapus creek wehrlite West branch width