IGNEOUS AND CRYSTALLINE ROCKS. 121 
A B C. D~. E F 
70.02 | 68.96] 62. 64 58. 99 
14.38 | 15.42 | 17.36 19. O1 
1.17 1.99 2.79 1.74 
13 -16 ~63 59 
61 «22 53 27 
66 25 1.70 2. 02 
5.48 6.59 7, 00 9.11 
5. 87 5.48 4.97 5, 07 
27 22 43 38 
44 . 30 53 1.24 
10 ol? 43 21 
01 04 02 07 
38 13 54 none 
trace | trace 12 04 
19 | none 06 96 
03 - 01 03 15 
02 07 04 08 
13 | trace 10 02 
06 | none 07 02 
trace | trace | none trace 
S absent from all. 
5. THE PARK CITY DISTRICT. 
Rocks collected by J. M. Boutwell, who furnishes the petrographic data. Analyses, 
hitherto unpublished, by W. F. Hillebrand, record No. 2173. 
A. Granite (?), head of Big Cottonwood Canyon. Essential constituents quartz, 
orthoclase, plagioclase, biotite, hornblende, and augite, with accessory apatite and 
perhaps sphene. 
B. Quartz diorite, Thaynes Canyon. Contains oligoclase, quartz, orthoclase, 
hornblende, and biotite, with accessory pyrite, apatite, and titanite. A little sec- 
ondary kaolinite and chlorite. 
C. Quartz diorite porphyry, Valeo mine. Contains plagioclase, hornblende, 
biotite, and quartz, with pyrite and some orthoclase, and secondary calcite, chlorite, 
and kaolin. 
D. Diorite porphyry, Daly West mine. Contains albite, hornblende, quartz, 
pyrite, and possibly apatite, with secondary chlorite or serpentine, calcite, epidote, 
kaolin, and muscovite. 
E. Diorite, Clayton Peak Amphitheater. Contains plagioclase, orthoclase, horn- 
blende, biotite, and augite, with accessory quartz, apatite, titanite, magnetite, and 
pyrite. 
F. Andesite, Ontario drain tunnel. Contains albite, hornblende, some quartz and 
magnetite. A green secondary mineral is probably serpentine. 
