Smithsonian Report, 1935. — Atwood 



Plate 4 



1. Glacial Striae on the Lavas Just North of the Devils Backbone. 



The Surface is highly polished and, except where the rock has chipped, owing to weathering, the striae are 

 very distinct. The ice moved in a N. 17° \V. direction across this lava surface. 



2. A Much Weathered, Glacially-Grooved Surface a Short Distance 

 South of the North Entrance Ranger Station. 



Although the age of the grooves is difhcult to determine, they appear to be related to a stage of giaciation 

 which ended with the return of volcanic action on the mountain. 



