72 
The American Geologist. 
February, 1896 
amorphosed rocks of sedimentary origin. It is generally a 
biotite hornblende granite with a varying amount of glassy 
plagioclase. A very coarse porphyritic variety occurs about 
the slopes of mount Whitney. The pale flesh tinted ortho- 
clase crystals reach a length of four inches and contain inclu¬ 
sions of the other constituents. Dikes of a fine grained vari¬ 
ety intersect the coarse. Granite underlies the gravels of the 
Mojave desert in northwestern San Bernardino county and 
eastern Kern, extending north through the Argus and Coso 
ranges to Owen’s lake. A specimen taken near the borax road 
between Garden station and Salt canon shows the presence of 
biotite, hornblende, much quartz and orthoclase, with little 
plagioclase. The granite of the southern portion of the 
Argus range where Salt canon crosses it is more basic. It 
contains an excess of dark glassy feldspar, biotite, little horn¬ 
blende and quartz. It is cut by dark dikes of diorite porphy- 
rite. The granite of the eastern portion of the Argus range 
contains large crystals of a flesh tinted orthoclase varying to 
gray, glassy plagioclase, biotite, hornblende, and little quartz. 
The granite of the southwestern portion of the range is a 
granular light colored rock with biotite, quartz, and horn¬ 
blende, while plagioclase is less prominent. This rock is cut 
by dikes of granite porphyry. This granite extends north 
through the Coso mountains to Owen’s lake and is probably 
continuous with that of the Sierra Nevadas. An axis of 
granite appears more or less prominent through the Panamint 
range. Good specimens of eye gneiss are found in the upper 
portion of Post Office canon. The rock consists of lenticular 
eye shaped crystals of bluish feldspar with alternate bands 
of mica and feldspar enveloping the large ciystals as in a 
flowage structure. A biotite hornblende granite with much 
quartz is very abundant in different parts of the Panamint 
range. A discontinuous axis of granite is characteristic of 
the Inyo and White Mountain ranges. Its greatest develop¬ 
ment is reached in the vicinity of New York butte and Mt. 
Hahn in the Inyo range. The most interesting type found 
here is a coarse rock with large porphyritic crystals of a 
brownish to grayish orthoclase, little plagioclase and quartz, 
and varying proportions of biotite and hornblende. A granite 
occurs on Blind Spring hill quite similar in character with 
