IGNEOUS AND CRYSTALLINE ROCKS. 155 
A. Soda syenite porphyry, dike east of Moccasin Creek. Tuoluwmnose. Consists 
mainly of albite, with a greenish mineral which is probably zegirite. Analysis by 
H. N. Stokes, record No. 1563. P. R. C. 773. 
B. Augite syenite, dike on Turnback Creek, about 1 mile north of Carter post-office. 
Highwoodose. Contains orthoclase and augite, with less plagioclase and quartz. 
Analysis by Stokes, No. 1642. P. R. C. 789. 
C. Diorite, dike 14 miles southeasterly from Sonora. Tonalose. Contains feldspar 
largely altered to hornblende. A few black grains are probably iron ore. Analysis 
by W. F. Hillebrand, record No. 1548. P. R. C. 759. 
D. Quartz-pyroxene diorite, large area east of Sonora. Harzose. Contains plagio- 
clase, quartz, biotite, augite, rhombic pyroxene, and a trace of iron ore. Analysis 
by Hillebrand, No. 1548. P. R. C. 760. 
E. Diorite, dike about 14 miles sourtheasterly from Sonora. Camptonose. Con- 
tains altered plagioclase and hornblende, with epidote, chlorite, and iron disulphide 
as secondary products. Analysis by Hillebrand, No. 1548. P.R. C. 761. 
F. Biotite-augite latite, 4 miles southwest of Clover Meadow. Toscanose. Called 
“‘trachyte-andesite tuff” in first edition of this bulletin. Contains plagioclase, biotite, 
augite, magnetite, apatite, and glass. Analysis by W. F. Hillebrand, record No. 
1597. P.R. C. 762. 
G. Augite latite, Dardanelle flow, near Clover Meadow. Monzonose. Contains 
plagioclase, in part labradorite, augite, iron ore, some olivine, apatite, and brown glass. 
The potassium is probably in the glass, as no potash mineral was observed. Analysis 
by H. N. Stokes, record No. 1645. P. R. C. 785. 
Hi. Augite latite, Table Mountain. Shoshonose. Called ‘‘basalt” in first edition. 
Contains labradorite, olivine, augite, and magnetite. Analysis by Hillebrand, record 
No. 1273. P. R. C. 724. 
I. Augite latite, Table Mountain, near Clover Meadow. Shoshonose. Contains 
labradorite, augite, olivine, magnetite, apatite, and glass. Analysis by George Steiger, 
record No. 1697. P. R. C. 763. 
