IGNEOUS AND CRYSTALLINE ROCKS. 165 
N. Scoriaceous rhyolite, Mono Craters, south of Mono Lake. Liparose. Described 
by Russell in 8th Ann., pt. 1, p. 380. Analysis by T. M. Chatard, record No. 36. 
O. Obsidian, Mono Lake. Liparose. Analysis by W. H. Melville, record No. 1346. 
Described by Lindgren in Bull. 150, p. 149. P. R. C. 60. 
P. Pumice, Mono Lake. Toscanose. Analysis by Melville, No. 1346. Described 
by Lindgren in Bull. 150, p. 148. P. R.C. 59. 
Q. Volcanic ash, east shore of Owens Lake. Collected and analyzed by Chatard, 
record No. 783. 
N oO iP; Q. 
75.78 | 67.39 55. 81 
12.39 | 15.99 10.07 
22 - 56 3. 43 
1.25 1.99 - 67 
31 att 2. 22 
81 1.63 1.05 
4.00 4.74 +75 
ae ote 4.64 4. 80 2.98 
20 a o- 65 
H20 above 11 al \ 2.06 2. 50 
TOE. <.ccrg ue ossan vases eanncusaers varacs naawe ss emus ResESeseremad mie |eaaene sldae seeRdleeesaeale - 80 
PaO Sis wise ncvem sien xeeee ee sere gs dd eeoNne sat sees See eee [Pease Selene seca seem yor 
MnO wseecnsececnexts sonbeacks oye axsueeeenarss stegeecense oy vei ceiceme seco sens lianestiga|s aeaceie -23 
CaCQ3...-...-.- 14. 44 
NaCl, soluble... .- 1.45 
NazSO,, soluble. . ze 2 80 
Nag Oa; SONIDIC cic. cosine pric seat ctreeeiclsites He ienneeGesinitieies aueismainessiinese sts Rooecane 2.09 
99.98 | 99.81 | 99.93] 100.21 
R. Soda syenite, from near Coalinga, Fresno County. Description supplied by 
Ralph Arnold. Contains plagioclase, hornblende, biotite, apatite, zircon, and iron 
ore, with secondary calcite, analcite, egirite, and white mica. Analysis by W. F. 
Hillebrand, record No. 2366. 
S. Quartz-augite rock, Hiriart Hill, Pala, San Diego County. Mainly quartz and 
augite. Collected and analyzed by W. T. Schaller, record No. 2309. 
T. Matrix of dumortierite, near Dehesa, San Diego County. Description and 
analysis, No. 2120, by Schaller. Consists chiefly of quartz, with andalusite or sil- 
limanite. For details see Bull. 262, p. 96. 
15619—Bull. 419—10—_12 
