114 ANALYSES OF ROCKS AND MINERALS, 1880-1908. 
5.85 - 43 4.31 31 
2.61 -15 3.24 04 
3.77 24 4.06 06 
- 46 . 50 25 58 
1.51 5.39 1.57 4.18 
1.10 1.21 -99 
1.33 | none 3. 49 none 
45 -ol -53 
URAC) hoc cipoac eich tes 
bes otaetate 7.19 1.56 
09; mone | trace 
03 - 06 12 
05 | trace 05 
100.32 | 99.40 | 99.73 
11. OURAY QUADRANGLE, 
Rocks described by Ernest Howe in Folio 153. Analyses by G. Steiger, record No. 
2200. 
A. Quartz-biotite latite, near head of middle fork of Cimarron Creek. Contains 
plagioclase, « little orthoclase, biotite, augite, accessory magnetite, and very little 
doubtful quartz. 
B. Quartz-biotite latite, north end of Cow Creek intrusive body, between Wild- 
horse Creek and the west fork pf Cow Creek. Contains plagioclase, very little ortho- 
clase, quartz, biotite, and magnetite. 
C. Quartz-pyroxene latite, west side of ridge between the Middle and East Cim- 
arron creeks. Contains andesine, hornblende, pyroxene, biotite, and magnetite. 
D. Quartz monzonite porphyry, Porphyry Basin, Middle Cimarron Creek. Con- 
tains plagioclase, orthoclase, biotite, hornblende, and magnetite. 
] 
At B C3 D 
SiO ne sedgadiascacst see ctmoeecs ao duewcnenians hones ceegauene game Aaes 59.83 | 68.81 | 60.69 61.36 
AlOz 15.86 | 15.54] 15.90 16. 36 
Fe03 4.0 1.78 4.52 3.59 
FeO 2.12 - 80 1.72 1.45 
MgO 2.73 52 1.93 1.75 
CaO 4.34 2.43 5. 23 3. 59 
Na,O 3.00 4,24 3.55 4.04 
Ke 3.55 4.07 3.22 3. 64 
H20 at 105° 1.09 - 50 +93 1.34 
H20 above 105° 2.04 78 -96 1. 56 
Ob sheesh ous cre Apiantod Sacer aise 70 28 73 51 
DUO te. ccaciconrasioas rea eE none | trace | trace trace 
CO wemcrspsisite siscecimesacaie 5 48 27 64 
PiOss oceSetanwe cadet aeccecie 31 13 31 36 
hOp asi atoadtetiatedeted esos none (?) none none 
MNO oecctncccdsceediesemedcenied - 06 .12 3 07 
BaQs eccessssscsesncsesucs 08 -13 10 12 
ST Oiseniasee ceimatygaccomaaatintsnieie ariawjsisinsicteiedionice acm seidin walnomeremeae canis 02 04 03 12 
100.39 | 100.65 | 100.22} 100.50 
5S and SO, absent, 
