291 G.'S. Hume — Stratigraphy and Geological Relations 



pected, although the actual proof was lacking. The dis- 

 covery of Ordovician sediments stimulated interest in this 

 outlier of Paleozoic rocks, and as the relationships of the 

 younger to the older rocks gave promise of throwing much 

 light on the history of the Laurentian plateau, the more 

 detailed work was assigned to the writer, who undertook 

 the present study in the following summer. 



Scope of the work. — This paper is a synopsis of a re- 

 port which will later be published in full by the Geological 

 Survey of Canada. In the complete report the strati- 

 graphic relations and faunal characteristics will be dis- 

 cussed in detail, and these, with the physiographic and 

 structural features found in the area of Paleozoic rocks, 

 will be applied to the regional history of the Laurentian 

 plateau. 



Acknowledgments. — The field work for this report was 

 undertaken under the direction of Doctor M. Y. Williams 

 of the Geological Survey of Canada, who gave valuable 

 assistance on a short reconnaissance trip, and to whom the 

 writer is further indebted for many helpful suggestions 

 during the progress of the whole work. 



In the preparation of the report, the work has been 

 under the supervision of Professor Charles Schuchert of 

 Yale University, to whom the writer wishes to acknowl- 

 edge his thanks. Thanks are also due to Professors H. E. 

 Gregory and Alan M. Bateman of Yale for helpful advice 

 and criticisms. 



Structure. 



Regional relations. — It has been shown by Miller (1913) 

 that there are three regional drainage systems along lines 

 of fracturing or disturbance. The most pronounced of 

 these water systems is in a northwest and southeast direc- 

 tions, including the drainage line of Lake Timiskaming 

 and Long and Kinogami lakes farther north. This drain- 

 age system is parallel to many other water courses, among 

 which the Montreal river is by far the most prominent. 



The second system of drainage is in a northeast and 

 southwest direction, and is best represented by a line 

 through the northeastward extension of Lake Timiskam- 

 ing at its northern end (see &g. 1). Continuing south- 

 west, this line of water courses passes along the longer 

 axis of Cobalt lake and about 4 miles of the Montreal 

 river, where it turns sharply from a northwest and south- 

 east direction to a northeast and southwest one between 



