Smithsonian Report, 1935. — Atwood 



PLATE 6 



1. A Portion of the Rim Showing the Large Black Dike Known as the 



Devils Backbone. 



The location of the oldest glacial record is indicated by the lower striae reading. The striae on the rim are 

 those pictured in figure 1 of plate 4 and were produced by the last glaciers to descend the west slope of 



Mount Mazama. 





^.y-'gr|i 



*i*- 



.^^^M^ . - - , *' 



,-w. ' .-;^ >f^.'. ~'-J^^'^Sisi^S^^^^^i^^sm:C$^ 



2. The Palisades as Seen From the Lake 



Beneath the talus material is a glacial till containing many well striated boulders. The bottom of the 

 deposit is presumably below the level of the lake. 



