CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
263 
5. MISCELLANEOUS ROCKS. 
A. Normal granodiorite from near lake at base of Bald Mountain, 
northwest of Sumpter. Yellowstonose. Described by Lindgren in 
22d Ann., Part II, p. 587. Contains quartz, hornblende, andesine, 
orthoclase, biotite, and magnetite. Slight alterations to epidote and 
chlorite are sometimes noticeable. Analysis by \Y. F. Hillebrand, 
record No. 1896. 
B. Rock from Wilbur, Douglas County. A tuff partly of igneous, 
partly of organic, origin. The igneous matter contains a few grains 
of feldspar and augite, with particles of a rock like diabase. The 
organic remains are partly calcareous and partly siliceous. Descrip- 
tion supplied by J. S. Diller. Analysis by H. N. Stokes, record No. 
1737. 
Si0 2 
Fe 2 3 
FeO. 
MgO 
CaO . 
Na 2 
H 2 at 105° . . . . 
H 2 above 105° 
Ti0 2 
C0 2 
ZK) 2 
IV), 
71.23 
14.61 
.93 
1.66 
1.01 
3.29 
4.00 
1.92 
.17 
. .55 
.34 
MnO 
BaO. 
SrO. 
Li 2 
.02 
.14 
trace 
.08 
.08 
.02 
trace 
100. 05 
55. 15 
"9.75 
7.76 
2.22 
10.48 
1.00 
.50 
2.70 
6. 59 
3. 64 
"Includes Ti0 2 and P»0 5 , if present. 
