IGNEOUS AND CRYSTALLINE ROCKS. 169 
G H. I J 
58. 41 52. 99 
17.85 16.71 
2. 67 3. 80 
3. 29 3.55 
3. 61 6.95 
6.81 8. 49 
3.77 3.56 
1.23 1.29 
234 -18 
86 59 
69 1.18 
+24 : 
none 02 
trace trace 
- 05 -12 
05 -07 
trace none 
trace trace 
99. 87 99. 92 
K. Hypersthene basalt, Anna Creek. Andose-beerbachose. Contains plagioclase, 
augite, hypersthene, olivine, and magnetite. P. R. C. 1320. 
L. Hypersthene basalt of andesitic type, north of Desert Cove. Tonalose. Con- 
tains plagioclase, hypersthene, augite, and olivine. 
M. Dark secretion from among dacitic ejectamenta, summit of Llao Rock. Ton- 
alose-andose. Contains plagioclase, hornblende, hypersthene, and augite, with a little 
olivine and apatite, in a dark-brown glassy groundmass. P. R. C. 1318. 
N. Light-colored secretion from among dacitic ejectamenta, southern rim of crater, 
between Sand and Anna creeks. Lassenose. Contains plagioclase, hypersthene, 
augite, hornblende, biotite, and quartz. P. R. C. 1319. 
O. Basalt, 1 mile east of the summit of the Cascade Range, on the road from Fort 
Klamath to Crater Lake. Beerbachose. Described by J. 8. Diller as a typical basalt, 
carrying a considerable amount of hypersthene. Analysis by W. F. Hillebrand, 
record No. 408. 
k L.; M. N oO 
SiOz 58.65 | 56.85 | 67. 41 57. 47 
AlO3.. 18.35 | 18.31 | 15.76 18. 86 
Fe,03. 1.59 2. 88 1.88 2.21 
FeO... 4.21 3.15 1.76 4. 08 
MgO.. 3. 49 3.92 1.35 4.27 
CaO... 6. 95 7.20 3. 36 7. 42 
NaO.. 3.70 3. 89 4.54 3. 85 
K.0 1,32 1.23 2. 36 -73 
HzO at 110°....... -20 -16 09 \ 22 
H20 above 110°... 31 70 95 54 : 
TiOg... 79 81 1.08 - 56 75 
22 12 24 
none OD | ceraie tease a 
trace | trace 10 
04 - 06 
trace | trace 1l 
99.88 | 99.81 | 100.34 
COs, CreOz, and LizO were absent from all five. 
4. PORT ORFORD QUADRANGLE. 
Rocks collected by J. S. Diller, and partly described by him in Folio 89. 
Analysis A by George Steiger, record No. 1892. B, D, E, F, by H. N. Stokes, record 
No. 1891. C, G, H, I, J, K, L, M, by W. F. Hillebrand, record No. 1897. 
A. Serpentine, from 12 miles north of mouth of Boulder Creek. 
B. Serpentine, from Iron Mountain crest. Contains, with serpentine, olivine, 
pyroxene, sometimes hornblende, and magnetite, with picotite or chromite. 
