Section IV, 1920 (15) Trans. R.S.C. 



The Relationships of the Palœozoic to the Pre-Camhrian along the 

 Southern Border of the Laurentian Highlands in Southeastern 

 Ontario and the adjacent Portions of Quebec 



By M. E. Wilson, B.A., Ph.D. 



Presented by J. A. Dresser, M.A., F.R.S.C, F.G.S.A 



(Read May Meeting, 1920) 



Introduction 2 & 3 



The principal structural and stratigraphical features that char- 

 acterize the Pakeozoic form.ations occurring along the southern border 

 of the Laurentian highlands in southeastern Ontario and the adjacent 

 portions of Quebec were long ago described in considerable detail by 

 Logan in the Geology of Canada, 1863, as well as later by Ells and 

 Ami in several reports of the Geological Survey and in numerous 

 papers contributed to the Transactions of this Society and other 

 publications. Recently, however, some new interpretations of these 

 data have been proposed by Kindle and Burling in a Museum Bulletin 

 entitled "Structural Relations of the Pre-Cambrian and Palaeozoic 

 Rocks north of the Ottawa and St. Lawrence Valleys."^ In this 

 publication it is concluded: 



1. That the Palaeozoic sediments occurring in the lower Ottawa 

 and St. Lawrence valleys occupy their present depressed position 

 with respect to the Laurentian highlands that adjoin them on the 

 north mainly because they have been downfaulted into this position ; 

 and 



2. That the southern border of the Laurentian highlands to the 

 north of the lower Ottawa and St. Lawrence rivers is delimited by a 

 through-going fault which expresses itself physiographically as a 

 fault-line scarp. 



The purpose of the present paper is to present additional data 

 bearing on this subject, and to point out that these data seem to indi- 

 cate that some modifications in the conclusions of Kindle and Burling, 

 previously cited, are necessary. 



1 No. 18, Geol. Surv. Can., 1915. 



" Published by permission of the Director of the Geological Survey. 



' The writer wishes to express his indebtedness to Messrs. E. D. Ingall, W. A. 

 Johnston, and other members of the stafï of the Geological Survey for suggestions 

 and criticisms contributed to a discussion of the subject of this paper at meetings of 

 the Logan Club of the Geological Survey in 1917. 



