458 /. HARLEN BRETZ 



Farther north occur the Redmond and Brinnon deltas, the former 

 with correlating terraces for the three stages of the lake indicated 

 by the outlet, the latter with but the lowest stage recorded. Associated 

 with these deltas are respectively the York and Bothel, and the 

 Poulsbo channels at appropriate altitudes, and each leading into a 

 valley open through to the Black Lake outlet at the south. 



Though the evidence of the two northern deltas may perhaps be 

 of insufficient weight to establish the extent of the master lake as far 

 north in the Sound as the Bothel and Poulsbo channels, yet it is 

 quite suggestive of such extension. The levels must otherwise be 

 explained as a coincidence of local ponding, and the greater lake must 

 in such case be considered as having lowered from the Black Lake 

 outlet earlier in the ice retreat, by tunnel drainage northward. 



It is of much interest to note that there is nothing in any collected 

 data concerning the various glacial lakes or the terraces of early 

 marine occupancy which suggests tilting or warping of the region in 

 the uplift which has taken place. 



It seems fitting that to this lake of Puget Sound, with outlet 

 southward through Black Lake channel and with levels controlled 

 by that channel, a name should be given in tribute to the work of a 

 geologist to whom our knowledge of the physiography of western 

 North America must always be deeply indebted. In memory of 

 Israel Cook Russell may this water body be known as Lake Russell. 



In an article by Upham in the American Geologist,^ the Black 

 Lake outlet is noted and the suggestion made that a glacial lake 

 probably existed in Puget Sound and discharged through the channel. 

 Upham supposed the col to be 170 feet high. This article was 

 not seen until the work on which the present article is based was all 

 but completed, the outlet region having already been examined three 

 times. Though having no influence on this work, it is hereby acknowl- 

 edged as the first published notice of the existence of Lake Russell. 



The writer is indebted to Mr. Bailey Willis for careful examination 

 and criticism of the data presented herewith, and for valuable sug- 

 gestions which have given broader conceptions and have modified 

 conclusions in this paper. 



I Warren Upham, "Glacial and Modified Drift in Seattle, Tacoma, and Olympia," 

 American Geologist, XXIV, No. 4. 



