IGNEOUS AND CRYSTALLINE ROCKS. 73 
Second group: Collected and investigated by Arnold Hague and J. P. Iddings. 
A. Pyroxene andesite, west of Dunraven Peak. Andose. Analysis by F. A. 
Gooch, record No. 116. Reported by Iddings as containing labradorite, augite, 
hypersthene, and magnetite, in a microlitic groundmass. 
B. Basalt, southwest of Dunraven Peak. Camptonose. Analysis by Gooch, No. 
118. Reported by Iddings as containing augite, olivine, labradorite-bytownite, and 
magnetite, in a globulitic glassy groundmass. 
C. Basalt, north spur of Prospect Peak. Auvergnose. Analysis by J. E. Whitfield, 
record No. 431. Reported by Iddings as containing labradorite, augite, olivine, and 
MIagnetite. Little glass in groundmass. 
D. Basalt, Yellowstone Canyon. Andose. Analysis by Whitfield, No. 430. Re- 
ported by Iddings as containing labradorite-bytownite, augite, olivine, magnetite, 
and a little brown glass. 
E. Basalt, Stinkingwater Canyon. Andose. See Iddings, Bull. Philos. Soc. Wash- 
ington, vol. 12, p. 205. Analysis by W. H. Melville, record No. 1232. 
65 \ 1s | te 
2.13 3.17 73 
BOF ercesnicieis a 4 - 20 41 31 
Fe, metal (doubtful). Sree eens 3. 26 Ts 8h |eerec cas 
IMM Oye 6 oye sartee tasicne cvayereselad wechaliiaveii d dhieed srepeielnfe's Gi ate c neers -18 | trace | none | trace -07 
F. Camptonite (?), dike in Stinkingwater Canyon. Andose. See Iddings, Bull. 
Philos. Soc. Washington, vol. 12, p. 205. Analysis by Melville, No. 1232. 
G. Kersantite, Bighorn Pass. Kentallenose. Described by Iddings in Mon. 
XXXII, pt. 2. Contains hornblende, plagioclase, orthoclase, quartz, augite, biotite, 
magnetite, chlorite, calcite, and apatite. Augite and hornblende partly decomposed. 
Analysis by Whitfield, No. 714. 
H. Basalt, dike, north spur of Mount Washburn. Andose. Analysis by Whitfield, 
No. 717. Reported by Iddings as approaching pyroxene andesite in composition. 
Contains labradorite, augite, serpentinized olivine, and magnetite, in a groundmass 
of globulitic and microlitic brown glass. 
