257 



units comprises a broad mountainous belt lying between 

 the Interior Plateau region and the coast, which has an 

 average width of about ioo miles (161 km.), and a length 

 in Canada of about 900 miles (1,448 km.) It is made 

 up largely of a composite mass of plutonic igneous rocks 

 called the Coast Range batholith, which has been thrust 

 through, and is flanked by, Paleozoic and Mesozoic sedi- 

 ments, blocks of which have been engulfed and are infolded 

 in it. 



Looking southwest from Mt. Ferguson, Lillooet district, showing mountains typical of 



the Coast range. 



The delta portion is relatively small and in Canada 

 has an area of over 1,000 square miles (2,592 sq. km.) 

 though it also extends southward into the State of Wash- 

 ington. It is floored by Eocene deposits of estuarine 

 origin which are covered by more recent Glacial and post- 

 Glacial materials. 



COLUMNAR SECTIONS. 



(By N. L. Bowen). 



Eastern part (Lytton to Hope). 



Pleistocene and Recent — Till, stream gravels, etc. 

 Unconformable relation. 



