304 ANNUAL EEPORT SMITHSONIAN INSTITUTION, 19 3 5 



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FiGUKB 1. — The youtbful Mount Mazama as it may have looked during the early stages of 

 its growth. Continued volcanic activity gradually produced a mountain. 



FiGDKE 2. — A later stage In the growth of the volcano. The cone is dormant and small 

 glaciers are present. Successive stages of vulcanism and glaciation followed. 



FiGORH 3. — Mount Mazama during one of its last periods of volcanic activity. A second- 

 ary cone, Little Mazama, is situated on the western slope. 



