146 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
J. Dolerite, Mount Ingalls. Hessose. Described by Turner in 14th Ann., p. 441. 
Contains plagioclase, augite, hypersthene, magnetite, and a few olivines. Analysis 
by W. F. Hillebrand, record No. 1273. P. R. C. 739. 
K. Dolerite, Mount Ingalls. Hessose. Also in 14th Ann., p. 441. Like J, but 
with scarcely any olivine. Analysis by Hillebrand, record No. 1432. P. R. C. 740. 
L. Basalt, 4 miles southeast of Mount Ingalls. Andose. Alsoin 14th Ann., p. 441. 
Contains plagioclase, olivine, augite, and magnetite. Analysis by Hillebrand, record 
No. 1273. 
M. Olivine basalt, 14 miles from Franklin Hill. Hessose. Contains plagioclase, 
augite, partly altered olivine, magnetite, and probably some glass. Description sup- 
plied by Turner. Analysis by George Steiger, record No. 1596. P. R. C: 755. 
N. Serpentine, Greenville. Described by Diller in Bull. 150, p. 372. Besides ser- 
pentine, the rock contains some magnetite and less chromite, with remnants of the 
pyroxene from which the serpentine was in great part derived. Analysis by W. H. 
Melville, record No. 1346. P. R. C. 145. 
4. BUTTE COUNTY. 
Rocks from this county are also to be found under the heading of the Lassen Peak 
region. The following rocks were collected by H. W. Turner, to whom the petrographic 
data are due. Analyses, with two exceptions, by W. F. Hillebrand, record Nos. 1482, 
1456, 1461, and 1548. Analysis G is by H. N. Stokes, record No. 1562. 
A. Granodiorite, north side of south fork of Feather River, opposite Enterprise. 
Lassenose. Described in 14th Ann., p. 441. Contains plagioclase, potash feldspar, 
quartz, hornblende, brown mica, and accessory minerals. The ferromagnesian 
minerals are largely altered to chlorite. P. R. C. 720. 
B. Granodiorite, 2 miles east of Bangor. Tonalose. Composition like A. The 
mica is largely altered to chlorite. See 14th Ann., p. 441. P.R.C.717. 
C. Diorite, South Honcut Creek. Beerbachose. Description supplied by Turner. 
Contains feldspar, probably all plagioclase, brown hornblende, and a little chlorite. 
P. R. ©. 775. 
D. Quartz diorite, 4.6 miles south of Table Mountain, on ridge between Butte and 
Plumas counties. Camptonose. Described in 17th Ann., pt. 1, p. 521. Contains 
hornblende, feldspar, quartz, rutile, and a little secondary chlorite and epidote. 
P. ay C. 758. 
E. Amphibole, separated from E. Analysis by William Valentine, record No. 1723. 
(1,0, determination by Hillebrand. 
