64 



the margins of batholithic and stock-like intrusions the 

 rocks have been altered to hornstone, andalusite schist, 

 crystalline limestone and lime-silicate rocks rich in garnet. 

 The contact with the Selkirk series is marked by a close 

 fold or fault. Small infolds of the Slocan rocks are of 

 common occurrence in the Selkirk series near the contact. 

 The Slocan series is noted chiefly for the system of fissure 

 veins which contain the important deposits of si ver-lead 

 and zinc ores (see p. 97). 



Pend d 'Oreille group — The Pend d'Oreille group 

 consists of andalusite, quartz and biotite schists, quartzites 

 and crystalline limestones. Though not definitely corre- 

 lated with the Slocan series the similarity in lithological 

 character would favour the view that the Pend d'Oreille 

 group is a more metamorphosed phase of the Slocan 

 series. 



CARBONIFEROUS AND POST-CARBONIFEROUS. 



Rossland group — The Rossland group is a complex 

 composed largely of rocks of igneous origin with a minor 

 development of sedimentaries. The igneous rocks are 

 represented by porphyrites, andesites, diabases, agglomer- 

 ates and tuffs with their schistose equivalents while the 

 sedimentary rocks are mainly slates and limestones, 

 the latter holding obscure Carboniferous fossils. Along 

 the International Boundary there is an apparent uncon- 

 formity between this group and the Pend d'Oreille group. 

 The group originally included the Mount Roberts formation 

 and the augite porphyrite series at Rossland (p. 85) 

 and the Rawhide and Brooklyn formations and Knob 

 Hill group at Phoenix (p. 75). 



Monzonite — -The monzonites are dark grey to 

 greenish-grey porphyritic or granular mottled rocks, 

 their period of intrusion ranging from Mesozoic to early 

 Tertiary. The intrusions have the form of plugs, dykes 

 and irregular masses approaching batholiths in importance. 



JURASSIC (?) 



Nelson batholith — The Nelson granodiorite batholith 

 has a very extensive development in West Kootenay 

 district and also extends into East Kootenay and the 

 Boundary district. The granodiorite is intrusive in all 



