CLARKE.] 
IGNEOUS AND CEYSTALLINE KOCKS. 
115 
4. ABSAKOKITE-SHOSHONITE-BANAKITE SERIES. 
Rocks from the Yellowstone Park and the Absaroka Range, described 
in Mon. XXXII, Ft. 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 Amer. Journ. Sci., 3d series, vol. 38, p. 46. 
A. Leucite-absarokite, Ishawooa Canyon, Wyoming. Camptonose. 
Bowlder. Contains olivine and augite in a groundmass of orthoclase 
and leucite. Accessory minerals, magnetite, apatite, and a few flakes 
of brown mica. Analysis by J. E. Whitfield, record No. 1057. Ma- 
terial dried at 104°. 
B. Absarokite dike, head of Lamar River. Lamarose. Contains 
olivine and augite in a groundmass of orthoclase and plagioclase, 
with accessory magnetite, biotite, and ilmenite. 
C. Absarokite dike, south of Clark Fork. Absarokose. Contains 
augite, quartz, biotite, magnetite, orthoclase, plagioclase, and some- 
times analcite. 
D. Absarokite lava flow, head of Raven Creek. Kentallenose. Con- 
tains olivine, augite, orthoclase, labradorite, magnetite, apatite and a 
little serpentine. 
E. Absarokite dike, divide east of Cache Creek. Ahsarokose. Con- 
tains orthoclase, plagioclase, augite, biotite, magnetite, serpentine, and 
occassional quartz. 
Analyses B, C, D, and E by L. G. Eakins, record Nos. 1086, 1365. 
A. 
B. 
c. 
D. 
E. 
Si0 2 
47.28 
11. 56 
3.52 
5.71 
13.17 
9.20 
2.73 
2.17 
2.96 
.88 
.59 
48. 95 
12.98 
3.63 
4.68 
11. 73 
7.66 
2.31 
3.96 
3.16 
.49 
.67 
48.36 
12.42 
5.25 
2.48 
9.36 
8.65 
1.46 
3.97 
5.54 
1.18 
.84 
trace 
.13 
.29 
51.76 
12.36 
4.88 
4.60 
9.57 
7.14 
1.99 
3.83 
3.05 
.47 
.56 
.11 
49. 71 
A1 2 0, 
13. 30 
Fe 2 3 
4.41 
FeO 
3.37 
MgO 
7.96 
CaO 
8.03 
Na 2 
1.49 
K 2 
4.81 
H 2 0... 
. 4.07 
Ti0 2 
1.57 
P 2 5 
.66 
O 2 0, 
trace 
MnO 
.13 
.13 
.17 
BaO 
.46 
CI 
.18 
0=C1 
100. 08 
.04 
100. 35 
99.93 
100. 32 
100. 01 
100. 04 
