162 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
E. Crystalline gabbro, Bagley Creek. Kedabekose. Contains plagioclase and 
diallage. Record No. 1166. 
F. Shaly 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. 
The following analyses are of serpentines derived from a peridotite-pyroxenite dike; 
H. Almost black. Possibly derived from adjacent shale. 
I. Almost black. Derived from pyroxenite. 
J. Bastite. Derived from pyroxenite. Record No. 1166. 
K. Friable serpentine. 
H I. J. K 
SiO2 40.50 | 36.57 36.96 
78 -95 39 
4.01 7.29 5.00 
FeO 2.04 37 2.34 
MgO 37.43 | 40.27 33. 84 
39 14 3.81 
28 31 34 
Tio at 166 lg gar | oa] 216 
20 a Pees Jesse anette sd an pate, ie i 9 y 
H20 above 100° ae 10.94 | 12.43 14.02 
TTACG! | <a meinare - 02 
Al -33 78 
«ll 31 trace 
-13 10 a 
99.99 | 100. 01 99. 89 
Accidental organic matter was deducted from analyses H and I, with subsequent recalculation of the 
data to 100 per cent. 
L. Serpentine. 
M. Talclike yellowish-green serpentine. 
N. Weathered serpentine. 
O. Olive colored, probably serpentine. 
Samples H, I, and J are from near Bagley Creek; K, L, M, and N from near Arroyo 
del Cerro; O from Ferguson ravine. M and O carry considerable chromite, 
