104 



Miles and 

 Kilometres. 



It follows the south slope of Rock creek valley 

 westward through a small area of Tertiary 

 volcanic rocks and on leaving it to ascend the 

 valley of Baker creek, it again enters Palaeozoic 

 rocks, exposures of which can be seen in the 

 railway cuts. 

 26 m. Bridesville — Alt. 3,407 ft. (1,038 m.). Near 



41 -8 km. the head of Baker creek the railway crosses the 



International Boundary line at a point two 

 miles east of Molson, and from this pont west- 

 ward to Chopaka on the Similkameen river, 

 the route lies in the State of Washington. 

 31 m. Molson — Alt. 3,705 ft. (1,128 m.). Molson 



49-8 km. is situated on the divide between Kettle river 

 and Okanagan river, in a region characterized 

 by rounded, grassy hills, on which there are 

 few exposures of the solid rocks. From here 

 an imperfect view can be obtained to the north 

 and west of a part of the great Interior Palateau 

 of British Columbia, noteworthy features of 

 which are the evenness of its skyline, and the 

 maturity of its topographic forms. From 

 Molson a descent of 2,764 feet (825 m.) is made 

 down a grassy open slope to the bottom of 

 Okanagan valley to Oroville, which is distant 

 25 miles (40-2 km.). 



42 m. Circle — Alt. 2,571 ft. (783 m.). The old 

 67-6 km. Palaeozoic rocks, through which the railway has 



run from Bridesville, are overlapped at Circle 

 by Tertiary rocks consisting of sandstones, 

 shales, and lavas, which cover the slope of 

 Okanagan valley virtually to Oroville. 

 56 m. Oroville — Alt. 941 ft. (286-8 m.). Oroville, 



90 km. a town of about one thousand inhabitants, is 

 situated in Okanagan valley at the south end of 

 Osoyoos lake and at the entrance of the Similk- 

 ameen river. Geologically it lies in one of the 

 interior lake basins of Oligocene age, the rocks 

 of which consist of conglomerates, sandstones, 

 and shale associated with some volcanic flows. 

 Okanagan valley, which has been cut through 

 this basin, is one of the main north and south 

 valleys of the Cordilleran region, and during 

 the Glacial period was occupied by the southward 



