U. S. GEOLOGICAL SURVEY 



BULLETIN 614 PLATE XVil 



A. MOUNT MAZAMA RESTORED. 



As it appeared before it collapsed to make the great pit now half filled by Crater Lake, which is nearly 2,000 



feet deep. 



B. WIZARD ISLAND, CRATER LAKE, GREG. 



A small volcano (cinder cone) that has grown up in the great pit formed by the collapse of Mount Mazanna. 

 Across the lake is Llao Rock, formed by a iava flow from Mount Mazanaa that now fills a little valley In the 

 nm of the crater. 



