9 



11. Horsefly river, British Columbia. 



12. Quesnel river, British Columbia. 



13. Cariboo gold mine, British Columbia. 

 li. Blackwater river, British Columbia. 



15. Tranquille river, British Columbia. 



16. Kamloops, British Columbia, 



17. Finlay river, British Columbia. 



18. Omineca river, British Columbia. 



19. Coal brook, Indian Reserve, North Thompson river, North-west Territories. 



20. Barrard inlet, British Columbia. 



DESCRIPTION OF LOCALITIES AND THEIR FLORAS. 



SOURIS RIVER. 



The locality referred to in this paper, and by Sir "William Dawson in his papers dealing 

 with descriptions of plants, as the Souris river, may be more specifically designated as 

 Roche Percee, inasmuch as that is the place from which the few specimens of that region 

 were chiefly obtained. 



Proceeding westward from the Pembina mountains along the International Boundary 

 from about longitude 102° to 106° 30' west, there are three important regions within 

 which the Lignite Tertiary beds present exposures. The first of these is the locality just 

 indicated. As the Souris river descends from the northwest along the foot of the Dirt hills 

 and the Missouri euteau, it reaches the Boundary Line at about longitude 103° 30', thence 

 turns north and east, following the line to nearly longitude 102° when it once more turns 

 south and crosses into the United States. In its easterly course it cuts through the Tertiary 

 formation and exposes its structure to a depth of fifty feet or more. 



The rocks of the Lignite Tertiary are first seen about four miles east of Short creek and 

 about six miles north of the Boundary at the place known as Roche Percee The 

 formation is the same as for other portions of the Lignite Tertiary along the International 

 Boundary, and its description may therefore be included in that for the Porcupine creek 

 and Great valley. 



The flora derived from Roche Percee is very meagre, but so far as it is known, it seems 

 to confirm the general conclusions at present accepted relative to the extension of the Lignite 

 Tertiary area and its relation to the floras of Porcupine creek, Calgary and the Mackenzie 

 River basin. This record as given by Sir "William Dawson (13) embraces the following 

 species : — 



Platanus nobilis, Newb. 

 Quercus sp. 



Sassafras selwyni, Dn. 

 Taxittis olriki, Heer. 

 Taxodium occidentale, Newb. 



From the point where the lignite beds are first seen, exposures occur at frequent inter- 

 vals in the banks of the Souris river, westward, to a distance of about twelve miles by the 



Line, and considerably more by the river. 

 9197—2 



