xii DEPARTMENT OF THE INTERIOR 



2 GEORGE V, A. 1912 



Page. 



Kersantite 312 



Camptonite 314 



Odinite 314 



Aplitic and acid apophysal dikes 314 



Dike phases of the Rossland and Beaver Mountain voleanics 315 



Relative ages of the eruptive bodies 316 



CHAPTER XIII. 



Formations of the Rossland mountain group 319 



Paleozoic formations 320 



Carboniferous beds in Little Sheep creek valley 320 



Carboniferous limestone in the Rossland mining camp 321 



Sutherland schistose complex. . . . ■ 321 



Summary 321 



Mesozoic sediments at Little Sheep creek 322 



Rossland volcanic group 323 



General description 323 



Petrography of the lavas and pyroclastics 324 



Augite latite 324 



Augite-biotite latite 326 



Augite-olivine latite 328 



Hornblende-augite latite 329 



Hornblende-biotite latite 330 



Biotite latite 331 



Femic augite latite 331 



Comparison with Sierra Nevada latite and with average mon- 



zonite 331 



Augite andesite 333 



Basalts 333 



Flow of liparitic obsidian? 333 



Tuffs and agglomerates 334 



Dunites cutting the Rossland voleanics 334 



Dunite on McRae creek 335 



Porphyritic harzburgite (picrite ?) 336 



Gabbros and peridotites near Christina lake 337 



Rossland monzonite 337 



Basic monzonite and hornblendite on Bear creek 344 



Shonkinitic type at Bitter creek 345 



Granite stock east of Cascade 345 



Trail batholith 346 



Definition 346 



Petrography 347 



Differentiation in place 348 



Shatter-belt 349 



