92 ANALYSES OF EOCKS, U. S. GEOLOGICAL SCJEVEY. [bull. 168. 
3. ABSAROKA RANGE. 
1st. crandall basin. 
Rocks described by Iddings in Mon. XXXII, Pt. II. The analyses 
also appeared in Bull. Phil. Soc. Washington, vol. 12, p. 204. 
A. Gabbro-porphyry, Hurricane Ridge. Contains augite, plagio- 
clase, Irypersthene, biotite, magnetite, and a little olivine. Analysis 
by L. G. Eakins, record No. 1089. 
B,. Basalt flow, north side of Timber Creek. Rich in olivine, augite, 
and magnetite. Analysis by Eakins, No. 1087. 
C. Basalt dike, ridge south of Hurricane Ridge. Like B. Contains 
also labradorite and a little orthoclase. Analysis by Eakins, No. 1087. 
D. Mica-gabbro-porphyry, Hurricane Ridge. Contains plagioclase, 
augite, hypersthene, biotite, and magnetite. Analysis by Eakins, 
No. 1089. ■ 
E. Mica-gabbro, Hurricane Ridge. Like D, with some orthoclase 
and a little quartz and olivine. Analysis by Eakins, No. 1089. 
F. Basalt-glass-breccia, ridge south of Indian Peak. A glass show- 
ing crystals of olivine, augite, plagioclase, and magnetite. Analysis 
by Eakins, No. 1087. 
A. 
B. 
c. 
D. 
E. 
F. 
Si0 2 
A1 2 3 
51.81 
15.24 
3.66 
4.86 
8.89 
9.06 
2.83 
2.08 
.67 
. 77 
.18 
.08 
52.09 
17.84 
4.27 
4.56 
5.33 
8.03 
3.39 
1.98 
1.77 
.39 
.27 
.14 
52.11 
16. 58 
3.66 
4.99 
6.87 
6.43 
3.25 
3.20 
1.99 
.53 
.63 
.23 
53.56 
16.07 
3.21 
5.29 
7. 23 
8.77 
3.06 
1.94 
.19 
.68 
.18 
.11 
53.71 
18.00 
3.99 
4.05 
5.19 
6.88 
3.50 
3.10 
.55 
.74 
.38 
.24 
53.89 
18.81 
4.92 
2.81 
3.29 
5.42 
3.65 
2.98 
2.99 
.49 
.52 
.17 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 
K 2 
H 2 
Ti0 2 
P 2 5 
MnO 
100. 13 
100. 06 
100. 47 
100. 29 
100. 33 
99.94 
