66 ANALYSES OF ROCKS AND MINERALS, 1880—1908. 
A B Cc. D 
BS LO Setees cde anc clevese! vie serareia toroinizr atio SI ie etaiok aie nee Orem ceee tiaras a Sento RSEINeES 64.23 | 60.00] 63.76 52.18 
MIOd-caeraesrGuuch yates: Salnoesetameces ae a zcei amen sade eets 16.34 | 16.37] 16.01 18.19 
POiO givnayeverrertereroamateser ani osieme Mtemroasiea sem amnmckee ace eR aeeceE 1.07 2.28 2. 22 3.31 
NG © at cnseeray.  oyrieeere merseaye wee ama lemon eiy outa cismiemee amit RRIS eis 1.58 2. 46 1.96 4.36 
PM Oona dinja aaainnn wisn nas SiS VSO Sie erase Sasha ora wedtevoronenatoraiaiaNsis eaten 2.47 3.81 2. 43 4.69 
CBO ooo a2 wsed suecmcicincen eae tis Saas ae eee eee Reg mpotese ss 3.07 4.96 4.55 6.51 
Na2O.......---- 3. 49 3.73 3.98 4.58 
KO wueaeeeacte 2.59 2.70 2.84 1.88 
GOAT Oreo caycerncea Pian eu as enenG moan eu alate 47 61 28 +75 
HgOiabove 10 ccccscecexe sw semamnoseushimoaedceteaenses 1.76 1.42 57 2.00 
TiO. .50 ; E 
DIKES IN BRECCIA. 
Descriptions supplied by Arnold Hague and T. A. Jaggar, jr. Analyses A, B, D, 
by H. N. Stokes, record No. 1804; C, E, F, G, H, by W. F. Hillebrand, Nos. 1765 
and 1801. 
A. Hornblende-pyroxene andesite, Eagle Creek. Camptonose. Contains plagio- 
clase, hornblende, pyroxene, quartz, and apatite. 
B. Leucite absarokite, Sunlight Valley. Lamarose. Contains phenocrysts of 
olivine and augite, with secondary alteration of the olivine to serpentine. The 
groundmass contains magnetite, augite, plagioclase, and orthoclase. Leucite abun- 
dant. 
C. Gabbro porphyry, Deer Creek. Shoshonose. Contains plagioclase, pyroxene, 
olivine, ilmenite, and apatite. 
D. Hornblende-augite andesite, Wind River Plateau. Tonalose. Contains phe- 
nocrysts of augite, hypersthene, and hornblende, plagioclase, and fine magnetite 
grains. 
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