SALIENT FEATURES OF THE GEOLOGY OF OREGON 83 



a) We think it inadvisable to run a physiographic boundary 

 across a main stream like that of the DesChutes, and suggest that 

 a heavy line (using the scheme of the Committee of American 

 Geographers) instead of a broken line be passed around the head 

 of this river. We think Columbia-DesChutes more appropriate 

 than Walla Walla as a name for this province. 



h) The writers are not yet ready to subscribe entirely to the 

 inclusion of the Willamette Valley in the Puget Sound Trough and 

 prefer the local name. 



c) The Coast Province may be better than Coastal Range, since 

 all of this province is not a mountain range. 



d) Cascade Plateau Province we think is more fitting for this 

 dissected plateau than "Cascade Mountains." 



/) As the Wallowa, or Eagle Creek, Mountains, as they are 

 sometimes called, are quite distinct in some ways, yet a part 

 of the Blue Mountains, we suggest the name Blue-Wallowa 

 Mountains. 



g) We would include all the territory east of the Cascades and 

 south of the Blue Mountains in one physiographic province. This 

 includes territory with nearly similar geology and mainly without 

 exterior drainage. There are differences here, of course, but we 

 think not sufficiently great to warrant such division. 



The hydrography of Oregon is interesting. The state is bounded 

 by water on almost the entire distance of three of its sides; on the 

 west by the Pacific Ocean; on the north by the master-stream, 

 the Columbia; on the east for more than one-half the distance by 

 the Snake. The northern and western portions are well drained by 

 the following streams, respectively, the John Day and DesChutes; 

 the Rogue, Umpqua, and Willamette. The major streams in 

 general in Oregon are northward flowing. The southeastern lava 

 plateau and desert region is a part of the Great Basin and therefore 

 practically without exterior drainage. 



The lakes of Oregon are especially interesting both for their 

 variety and for their diverse origins. One of these is perhaps the 

 most famous of all the lakes of North America, namely Crater 

 Lake at the summit of the Cascade Mountains. We note the 

 following types, which we can only name in passing in an article of 

 this kind: 



