390 N. H. 'CARTON — CATALOG OF PHOTOGRAPHS 



242. The cinder cone from the south, earlier lava partly covered by volcanic sand. 



The 'dead trees extend down 7 feet through the volcanic sand to the orig- 

 inal soil beneath (No. 245). 



243. The cinder from the east. Earlier lava near the cone is covered by volcanic 



sand ; later lava in the foreground uncovered (No. 247a). 



244. The lava field looking southeast from the base of the cinder cone toward 



Snag lake (No. 273). 



245. Volcanic bombs at the base of cinder cone ; the largest is 8 feet in diameter 



(No. 248). 



246. Surface of lava field ; breaking of the lava crust (No. 272). 



247. The tree projecting from beneath the lava was pushed over by the advanc- 



ing lava. The dead tree on the left extends 10 feet down through the 

 coating of volcanic sand to the original soil beneath. The living trees, 

 some of which are about 200 years old, have grown up entirely since the 

 eruption (No. 275). 



248. Lava dam which formed Snag lake at the time of the eruption and drowned 



the trees whose stumps are seen in the lake (No. 267). 



249. Snag lake, with lava dam in the distance and the stumps of drowned trees 



in the foreground (No. 266). 



250. Lava front at the corner of Snag lake (No. 268). 



251. Near view of lava blocks on edge of lava field. The lava is basalt, which is 



remarkable in containing numerous phenocrysts of quartz, uniformly 

 distributed throughout the mass. The white spots seen in the lava are 

 quartz (No. 271). 



252. Hand specimen of quartz basalt from lava field near Snag lake. The white 



spots are quartz (No. 269). 



Photographed by C. D. Walcott 



6o by 8J, excepting Nos. 270, 272-274, which are 5 by 7 inches. Negatives in the 

 United States Geological Survey 



253. Overturned fold in Cambrian quartzites, north side of Silver canyon, White 



Mountain range, Inyo county, California (No. 213). 



254. Cambrian quartzites showing vertical cleavage of the strata. Soldiers can- 



yon, Deep Spring valley, Inyo county, California; White Mountain range 

 (No. 2156). 



255. Lower Cambrian quartzites showing vertical cleavage in massive layers and 



interbedded thin layers without cleavage. Soldiers canyon, above Deep 

 Spring valley, White Mountain range, Inyo county, California (No. 217). 



256. Lower Cambrian quartzites showing vertical cleavage in massive layers and 



interbedded thin layers without cleavage. Soldiers canyon, above Deep 

 Spring valley, White Mountain range, Inyo county, California (No. 217 d). 



257. Nearer view of quartzite cliff on south side of Soldiers canyon, above Deep 



Spring valley, White Mountain range, Inyo county, California (No. 216). 



258. View of low hills 1 mile southwest of Antelope springs, Deep Spring valley, 



Inyo county, California ; showing synclinal in Cambrian limestones resting 

 on quartzites (No. 224e). 



259. View of granitic mountain range on side of Deep Spring valley, Inyo county, 



California (No. 226c?). 



