CALIFORNIA 389 



218. Perched boulder, near Jura lake, Mono valley, California (No. 36). 



219. Joints in granite, mount Lyell, California (No. 56). 



220. Gibbs canyon, from Williams butte, Mono valley (No. 32). 



221. Bloody canyon, south of Mono lake (No. 79). 



222. Lake canyon, near Mono lake. Partially refilled after being glaciated (No. 



70). 



223. Mount Lyell, from the Tuolumne meadows, California (No. 52). 



224. End of Obsidian flow. Mono craters, Mono valley, California (No. 62). 



225. Mono crater, from the south (No. 61). 



226. Eolian erosion in rhyolite, Mono valley (No. 92). 



227. Tuolumne valley, California, showing upper limit of ancient glacier (No. 87). 



228. Mount Dana, California, from the west. A small glacier on northern slope, 



glaciated country to the right (No. 74). 



229. Mount Dana glacier, northern side of Mount Dana (No. 45). 



230. Mount Dana glacier, northern side of Mount Dana (No. 46). 



231. Mount Dana glacier, northern side of Mount Dana (No. 49). 



232. 233. Double plate. Mount Lyell glacier, northern side of Mount Lyell, Cali- 



fornia (Nos. 53 and 51). 



234. Glaciated dome in Tuolumne valley, California. 



235. Contorted lake-beds near southern margin of Mono lake, California (No. 41). 



Photographed by J. S. Diller 

 8 by 10 inches. Negatives in United States Geological Survey. 



236. Burney falls, Shasta county, California. The upper portion of the falls is 



over basalt and the lower portion over infusorial earth (No. 235a). 



237. Deposit of infusorial earth 110 feet thick near Great bend of Pitt- river, Shasta 



county, California. 



238. Hydraulic mining, Cherokee Flat, Butte county, California (No. 159a). 



239. Lava-capped river bed of the ancient Sacramento, near Delta, California. 



The embankment midway between the river below and its ancient bed 

 beneath the lava above is occupied by a railroad. The lava stream is 

 from Mount Shasta and it follows the canyon of the Sacramento for nearly 

 50 miles (No. 97). 



Volcanic Eruption in northern California 

 Photographed by J. S. Diller 

 8 by 10 inches. Negatives in United States Geological Survey 

 Nos. 240-251 are published in Bulletin 79, U. S. Geological Survey. 



240. Model of cinder cone, lava field, and ash-covered slopes. The cinder cone 



is 640 feet high, the crater is 240 feet deep, and the lava field is about 3 

 miles long. Snag lake, at the left end of the lava field, was formed by 

 the lava dam (No. 241). 



241. Lava field and cinder cone, looking southwest across Lake Bidwell; Lassen 



peak in the distance (No. 280). 



LVII— Bull. Geol. Soc. Am., Vol. 13, 1901 



