IGNEOUS AND CRYSTALLINE ROCKS. 135 
b 3.36 
2 Includes TiOg and P205. b Loss on ignition. 
CALIFORNIA. 
1. MOUNT SHASTA. 
Description of rocks furnished by J. 8. Diller, who also described A, B, and C in 
Bull. 150, pp. 221, 227. : 
A. Hornblende andesite, Black Butte, west base of Shasta. Yellowstonose. Con- 
tains plagioclase and hornblende in a microlitic groundmass. The latter carries 
hypersthene, magnetite, and amorphous matter. Analysis by W. H. Melville, record 
No. 1346. P.R.C. 84. 
B. Hypersthene andesite, older flow, west base of Shasta. Yellowstonose. Con- 
tains plagioclase, hypersthene, magnetite, and glass. Analysis by Melville, No. 1346. 
P. RB. C. 87. 
C. Hypersthene andesite, like B, same locality, later flow. Tonalose. Analysis 
by Melville, No. 1346. P. R. C. 87. 
D. Pyroxene andesite, late flow, eastern side of Shasta. Tonalose. Contains small 
crystals of plagioclase and hornblende in a dark groundmass. Thin section not 
examined. Analysis by H. N. Stokes, record No. 1532. P. R. C. 1415. 
E. Plagioclase basalt from near McCloud River, south of Mount Shasta. Hessose. A 
gray cellular rock. Thin section not examined. Analysis by Stokes, No. 1532. 
P.R. C. 1416. 
F. Andesite basalt, Delta, Shasta County. Beerbachose. Much plagioclase and a 
few hypersthene crystals in a groundmass chiefly of feldspar, pyroxene, magnetite, 
and trace of olivine. Analysis by Melville, No. 1346. P. R. C. 1417. 
