IGNEOUS AND CRYSTALLINE ROCKS. 
99 
4. ABSAROKITE — SHOSHONITE — BANAKITE SERIES. 
Rocks from the Yellowstone Park and the Absaroka Range, described 
in Mon. XXXII, Pt. II, and also by Iddings in Journal of Geology, 
vol. 3, pp. 938, 943, 947. The rock A, from Ishawooa Canyon, is also 
described by Hague in Araer. Journ. Sci., 3d scries, vol. 38, p. 46. 
A. Leucite-absarokite, Ishawooa Canyon, Wyoming. Bowlder. 
Contains olivine and augite in a groundmass of orthoclase and leucite. 
Accessory minerals, magnetite, apatite, and a few Hakes of brown mica. 
Analysis by J. E. Whitfield, record No. 1057. Material dried at 104°. 
B. Absarokite dike, head of Lamar River. Contains olivine and 
augite in a groundmass of orthoclase and plagioclase, with accessory 
magnetite, biotite, and ilmenite. 
C. Absarokite dike, south of Clark Fork. Contains augite, quartz, 
biotite, magnetite, orthoclase, plagioclase, and sometimes analcite. 
D. Absarokite lava flow, head of Raven Creek. Contains olivine, 
augite, orthoclase, labradorite, magnetite, apatite, and a little serpen- 
tine. 
E. Absarokite dike, divide east of Cache Creek. Contains ortho- 
clase, plagioclase, augite, biotite, magnetite,-serpentine, and occasional 
quartz. 
Analyses B, C, D, and E by L. G. Eakins, record Nos. 1086, 1365. 
SiO, 
Fe 2 3 
FeO.. 
MgO . 
CaO_. 
Na 2 . 
K 2 a.. 
H 2 0.. 
Ti0 2 . 
PA . 
OA. 
MnO. 
BaO.. 
01—. 
0=01. 
A. 
47.28 
11.56 
3.52 
5.71 
13.17 
9.20 
2.73 
2.17 
2.96 
.88 
.59 
13 
18 
100. 08 
.04 
100. 04 
B. 
48.95 
12.98 
3.63 
4.68 
11.73 
7.66 
2.31 
3.96 
3.16 
.49 
.67 
.13 
100. 35 
48.36 
12.42 
5.25 
2.48 
9.36 
8.65 
1.46 
3.97 
5.54 
1.18 
.84 
trace 
.13 
.29 
99.93 
51. 76 
12.36 
4.88 
4.60 
9.57 
7.14 
1.99 
3.83 
3.05 
.47 
.56 
100. 32 
i-:. 
49.71 
13.30 
4.41 
3.37 
7. 96 
8. 03 
1.49 
4.81 
4.07 
1.57 
.66 
trace 
.17 
.46 
100.01 
