214 ANALYSES OF ROCKS, U. S. GEOLOGICAL SURVEY. [bull. 168. 
E. Crystalline gabbro, Bagley Creek. Contains plagioclase and 
diallage. Record No. 1166. 
F. Shaty gabbro. Friable, containing carbonates and sulphates. 
Somewhat resembles serpentine. 
G. Shaly gabbro, like F, much resembling a true serpentine. 
According to Turner, F and G are merely weathered layers of the 
gabbro. 
Si0 2 
A1A---- 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 Oatl05°.... 
H 2 above 105° 
PA 
MO..... 
MnO 
co 2 
so 3 
Organic matter. 
E. 
47.49 
15.81 
1.07 
4.50 
10.39 
15.53 
1.16 
trace 
1.20 
1.83 
trace 
.06 
.41 
99.45 
45.43 
12.55 
6.50 
13.41 
12.39 
1.71 
.11 
2.41 
2.74 
.04 
.21 
2.35 
.24 
trace 
100. 09 
45.69 
13.30 
1.85 
4.72 
13.06 
13.50 
1.36 
trace 
2.29 
2.47 
.06 
.24 
1.89 
.43 
100. 86 
