[KLLs] PAL/EOZOIC OUTLIERS IN THE OTTAWA RIVER BASIN 149 



As already intimated very considerable collections of the contained 

 organic remains have been made at various times. These have now been 

 determined and have been properly classified and arranged under their 

 respective localities by Dr. H. M. Ami and by Mr. L. M. Lambe. As 

 these lists will be of great benefit for the purpose of determining exact 

 horizons and for assisting in the future study of these interesting out- 

 liers, a number of them have been prepared, which will shortly appear in 

 the Geological Survey's report on this area, now in course of publication. 

 It may be remarked, however, that the fossiliferous sediments of the 

 extreme western portion of the basin differ very considerably from those 

 of the typical areas as developed along the lower Ottawa in lithological 

 character ; and in this respect they approach somewhat the sediments 

 found in the basins of Lake Ontario, Erie and Huron, where apparently 

 somewhat different conditions of deposition have prevailed. The deposits 

 are somewhat more sandy and dolomitic in their character, resembling 

 the peculiar deposits of similar horizons seen in the valley of the Red 

 Eiver in Manitoba ; so that those of the upper Ottawa apparently par- 

 take of the character of both, or are intermediate between those of the 

 two districts, so widely separated by distance. Those of the lower Ottawa 

 are for the most part clearly due to conditions of deep water deposi- 

 tion, while the western deposits are apparently more littoral in character 

 or have been laid down in shallow waters. The evidence therefore seems 

 fairl}'- conclusive that over a very large portion of the Ottawa Elver basin 

 the Pala>ozoie formations wei'e at one time continuous over its greater 

 part. The subsequent denudation must, however, have been enormous, 

 since not only has the greater part of these been removed, the evidence 

 of such removal being readily seen in the many bold escarpments at 

 widely separated points throughout the area, but there are also great 

 deposits of clays, sand and gravel, which constitute a marked feature 

 over many portions of the basin itself 



Sec. IV., 18J6. 9. 



