58 
Explanation of Plate V. 
View looking northeast across the valley, of the Tulameen river with upland 
in the distance. The points a and b on the horizon are 6 and nearly 8 
miles respectively from the camera. A variation in the skyline of rfrs 
of an inch on the photograph between a and b is equivalent to an actual 
difference in level of nearly 80 feet in the topography. Between a and 
b is a wide upland draw with side slopes of about 100 feet to the mile. 
In the foreground a “flat” surface planes across a centroclinal basin of 
Tertiary shales and sandstones. See profile 6, Figure 2. 
