388 DEPARTMENT OF THE INTERIOR 



2 GEORGE V., A. 1912 



schists; (2) that the Smelter granite stock cuts both those formations; (3) that 

 all three formations mentioned have been crushed and that the two older bodies 

 have been intensely metamorphosed during orogenie movements; (4) that the 

 heavy masses of agglomerates and tuffs of the Phoenix group contain many 

 fragments of the Attwood limestone and other sediments, apparently indicating 

 that the latter rocks were already well consolidated, if not somewhat metamor- 

 phosed, before the Phoenix agglomerates were formed; (5) that the Attwood 

 sedimentaries and, in apparently less degree, the Phoenix volcanics are intensely 

 crumpled and sheared; and (6) that the granodiorite of the region cuts both 

 those groups of rock and has been itself not seriously deformed since its con- 

 solidation from the magmatic condition. 



It should be also noted that, in the northern part of the Boundary Creek 

 district and thus outside the five-mile Boundary belt, Mr. Brock has mapped 

 and described many small bosses, dikes, and sheets of porphyritic alkaline syenite 

 of the pulaskite type. This intrusive cuts all the other formations of the 

 district, including conglomerate, shale, and lignite-bearing sandstone with 

 associated volcanics, all of which Mr. Brock regards as almost certainly of 

 Tertiary, and perhaps of Oligocene, age. He points out the great similarity 

 of the pulaskite to that composing the Coryell batholith and other large bodies 

 of West Kootenay. 



On the whole, therefore, it appears clear that the succession of rock-forma- 

 tions in the Rossland mountains and in the ' Boundary Creek district ' is 

 strikingly similar. This is, of course, not surprising, in view of the fact that 

 the two districts lie side by side. The point is specially stated again, since it 

 is chiefly this parallelism in the histories which has emboldened the writer to 

 draw up the following tentative scheme of correlation for the rocks between 

 Christina lake and Midway. 



Correlation, Christina Lake to Midway. 



Glacial and Recent deposits Pleistocene. 



Syenite and syenite porphyry (north of five mile belt) Miocene ? 



Conglomerate, sandstone, shale, and lignite (north of five-mile belt) Oligocene. 



Unconformity. 

 Serpentine, intrusive bodies. 



Ph0miX PyZLtics, flows?, and \<W *— ' 



Contemporaneous intrusions of porphyrite .) 



Smelter granite stock (aplitic satellite from Cascade batholith ?) ^ 



Granodiorite stocks, dikes, etc J- Jurassic. 



Cascade gneissic batholith J 



Attwood series (argillite, quartzite and limestone) Paleozoic, probably 



Carboniferous. 



Chlorite and hornblende schists ? 



Grand Forks schists ? 



