!LARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
189 
J. Dolerite, Mount Ingalls. Described by Turner in 14th Ann., p. 
1:41. Contains plagioclase, augite, hypersthene, magnetite, and a few 
>livines. Analysis by W. F. Hillebrand, record No. 1273. P. R. C. 739. 
K. Dolerite, Mount Ingalls. Also in 14th Ann., p. 441. Like J, 
)ut with scarcely any olivine. Analysis by Hillebrand, record No. 
.432. P. R. C. 740. 
L. Basalt, 4 miles southeast of Mount Ingalls. Also in 14th Ann., p. 
:41. Contains plagioclase, olivine, augite, and magnetite. Analysis 
>y Hillebrand, record No. 1273. 
M. Olivine-basalt, 1£ miles from Franklin Hill. Contains plagio- 
lase, augite, partly altered olivine, magnetite, and probably some 
flass. Description supplied by Turner. Analysis by George Steiger, 
ecord No. 1596. P. R. C. 755. 
N. Serpentine, Greenville. Described by Diller in Bull. 150, p. 372. 
besides serpentine, the rock contains some magnetite and less chro- 
irite, with remnants of the pyroxene from which the serpentine was in 
Teat part derived. Analysis by W. H. Melville, record No. 1346. 
\ R. C. 145. 
Si0 2 
A1A 
Fe 2 3 
FeO 
MgO 
CaO 
Na^O 
K 2 
H 2 Oatl00°... 
H 2 above 100 c 
Ti0 2 
P 2 5 — 
MnO 
SrO 
BaO 
Chromite 
53.91 
17.95 
2.21 
4.80 
5.52 
10.40 
2.90 
1.34 
.20 
.20 
.52 
.21 
.10 
trace 
.05 
trace 
100. 31 
52.81 
16.60 
2.66 
6.13 
6.12 
10.14 
2.79 
1.05 
.38 
.54 
.84 
.23 
undet. 
trace 
.03 
trace 
100. 32 
50.56 
14.71 
3.54 
8.90 
4.07 
7.58 
2.94 
2.10 
1.06 
1.12 
1.71 
1.14 
.13 
trace ? 
.25 
trace ? 
99.81 
M. 
51.21 
17.59 
4.71 
4.42 
7.12 
10.36 
2.49 
.91 
.58 
1.07 
.31 
.09 
trace 
none 
none 
100. 86 
N. 
39.14 
2.08 
4.27 
2.04 
39.84 
trace 
12.70 
.11 
100. 18 
