REPORT OF THE CHIEF ASTRONOMER xi 



SESSIONAL PAPER No. 25a 



CHAPTER XI. 



Page. 



Stratigraphy and structure of the Selkirk mountain system (resumed) . . 257 



Kitchener formation 257 



Priest River terrane 258 



Exposures and conditions of study 259 



Petrography of Belt A 260 



Petrography of Belt B 261 



Petrography of Belt C 264 



Petrography of Belt D 264 



Petrography of Belt E 265 



Petrography of Belt F 267 



Petrography of Belt G 268 



Thicknesses and structure in the Priest River terrane 268 



Correlation . „ . 270 



Pend D'Oreille group 271 



General description 271 



Area east of Salmon river 273 



Area west of Salmon river 275 



Correlation 275 



Summary on the structure of the Nelson range 277 



CHAPTER XII, 



Intrusive rocks of the Selkirk mountain system 281 



Metamorphosed basic intrusives in the Priest River terrane 282 



Abnormal granite intrusive into the Kitchener quartzite 283 



Rykert granite batholith 284 



Bayonne batholith and its satellites 289 



Petrography of the batholith. . . •. . . . . 290 



Contact metamorphism 293 



Satellitic stocks on the divide 296 



Petrography 296 



Contact metamorphism 297 



Qnartz-diorite apophyses 300 



Relation of the stocks to the Bayonne batholith 301 



Lost Creek granite body 302 



Bunker Hill stock 303 



Salmon River monzonite 304 



Lamprophyric dikes and sills 306 



Porphyritic mica minette 306 



Augite minette 307 



Hornblende-augite minette 308 



Olivine-augite minette 310 



Comparison of the minettes with the world-average 311 



