IGNEOUS AND CRYSTALLINE ROCKS. 91 
C. Basic syenite or monzonite (yogoite), Beaver Creek. Monzonose. Contains 
orthoclase, plagioclase, diopside, biotite, iron oxides, and apatite. P. R. C. 902. 
D. Shonkinite, Beaver Creek. SR. 3 of wyomingase. Contains anorthoclase, diop- 
side, biotite, iron oxides, and apatite, with very little olivine and probably a trace of 
nephelite. P. R. C. 901. 
E. Leucitite, Bearpaw Mountains. Chotose. An olivine-free leucite basalt. Con- 
tains leucite, augite, iron oxides, rarely biotite, and very little glassy base. P. R. C. 
903. 
F. Tinguaite, dikeon Bear Creek. Judithose. Contains orthoclase, nephelite, can- 
crinite, augite, egirite, apatite, a little sodalite, and a doubtful fibrous: hornblende. 
P. R. C. 899. 
G. Pseudoleucite-sodalite tinguaite. Beaver Creek. Janeirose. Contains ortho- 
clase, nephelite, sodalite, nosean, egirite, diopside, and fluorite. P. R.C. 904. 
