96 



THE ROYAL SOCIETY OF CANADA 



this portion of the trench is not as full as that concerning the south- 

 ern part of the trench. The Nechako River and a portion of the 

 Fraser River north of a point in the vicinity of Soda Creek in late 

 Cretaceous times is believed to have drained northwards by way of the 

 present Crooked River into the Peace. This is indicated by the 

 abnormal northwesterly direction of the tributaries of the Fraser 

 River from Soda Creek northwards to the Big Bend of the Fraser. 



J Modern drainage . ► 



L ate Tertiary (Pliocene ?)drainage ~ * 



Geo/o^/ca/ Survey. Canada. 



Figure 5 



These tributaries almost without exception flow in an upstream 

 direction as regards the Fraser River, which is contrary to the normal 

 or downstrean direction of the tributaries in a normal drainage 

 system. The tributaries of the Fraser south of Soda Creek all 

 enter the Fraser in the normal way. From these facts it is con- 

 cluded that in late Cretaceous times a divide existed south of Soda 

 Creek between the drainage of the south-flowing Fraser and the 

 north-flowing river which formed part of the drainage system of the 

 Peace River. That the Fraser River was present in Cretaceous and 

 early Tertiary times is shown by the presence of Cretaceous and early 

 Tertiary sediments in the Fraser valley in the lower part of its course 



