Abstract
This paper is chiefly (I) an outline of the geology of the territory lying along the southern border of the Canadian pre-Cambrian shield in southeastern Ontario and the adjacent parts of Quebec, and (2) a comparison of the formations of this region with those of the territory extending from Lake Huron and Lake Superior to Lake Timiskaming and Lake Mistassini-the Timiskaming subprovince. The bed-rock formations of the Grenville subprovince, except for a few late pre-Cambrian igneous intrusives, all belong to a basal complex composed of three rock groups: (1) a group of marine sediments with some locally associated volcanics-the Grenville and Hastings series; (2) a related series of igneous intrusives-peridotite, gabbro, diorite, shonkonite, etc.; and (3) batholithic masses of syoenite and granite. A comparison of these formations with those composing the basal complex of the Timiskaming subprovince shows that with the exception of group 3, the formations of the two regions are almost entirely different and...
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