31 



is about six miles in its greatest width, lying northwest and southeast from a little below 

 Sifton pass to twentj-five miles below Fort Grahams. 



McConnell (67,35-370) informs us that Tertiary conglomerates interbedded with shales 

 and sandstones occupy the bottom of the Finlay valley from the Ingencia river north to 

 Tochieca, and thence northward along the latter. They reappear again on the Finlay a few 

 miles farther west in a parallel valley which it enters and follows for some distance. They 

 are also found on the Om.neca from the Black canyon to its junction with the Tchutetzeca. 

 These beds were probably deposited in Tertiary lakes. 



The collection of plants secured by McConnell in 1894 were examined by Sir 

 "William Dawson and reported to include (14,36,370) 



1. Grewia sp. 



2. Leguminosites arachnoides, Lesq. 



3. Sequoia couttsice, Heer. 



4. langsdorfii, (Brongn.) Heer. 



5. Vihurnum asperum, Newb. 



He concluded that they indicated an Upper Laramie age. 



Omineca River. 



The Omineca river flows east from about 126° W. to a junction with the Finlay. The 

 greater portion of its extent, for seventy-five miles, passes through an undetermined area, 

 supposedly Oambro-Silurian and Triassic, with some volcanic and some limestone formation. 

 From this locality, McOonnell brought a small collection of plants in 1894, and Sir 

 William Dawson was able to recognize among the specimens. (14,36-37) 



1. Arundosp. 



2. Platanus haydenii, Lesq. 



3. Populus arctica, Heer. 



4. nebrascencis, Heer. 



5. speciosa, Ward. 



6. Quircus sp. 



7. Sequoia couttsice, Heer. 



8. langsdorfii, (Brongn) Heer. 



Sequoia was reported as very abundant, and the conclusion was reached that the forma- 

 tion was Upper Laramie. 



Coal Brook. 



Coal brook is an isolated locality, forming an outlier of the general Tertiary area at 

 Indian reserve on the North Thompson river, and distant about 128 miles north of the Sim- 

 ilkameen. The rocks of this formation, as exposed on the left bank, are referred to by G. 

 M. Dawson (ll,20B) as old and chiefly much altered volcanic products with limestones and 

 quartzites, while those on the right bank are in the main referable to the Tertiary volcanic 

 period. Dr. Selwyn also deals with this formation in a general way (**3,2o). 



The area constitutes an outlier of the Tertiary formation and is embraced in a hill 600 

 feet in height and about two and a half miles long. The beds are exposed by the cutting 

 of Coal brook and the removal of a thick covering of boulder clay and drift. The whole 



