52 TUE MAKQUETTE lEOT^ BEARING DISTEICT. 



(XIII) lies above tlie jasper-schist. It consists of beds of mixed ore and 

 jasper, in which the hunint^j are contorted and twisted, indicating the presence 

 of larger folds in the formation as a whole. Conglomerates were also seen 

 by the author in portions of tins belt. Specular ore, magnetite, and a bed 

 of magnesian schist make up the Ijalance of the iron formation. Above the 

 iron formation is the upper quartzite (XH' )> which near the contact with 

 the ores is conglomeratic, and above the quartzite is another bed of diorite 

 (XV), whicli has some resemblance to the micaceous clay-slate of Spurr 

 Mountain. It will be observed that the author has fairly good evidence 

 here of the existence of an erosion interval between portions of the iron 

 formation and the up[)er quartzite; Ijut unfortunately he regarded the pres- 

 ence of the conglomerate at the base of the upper quartzite as possessing 

 little significance. This conglomerate is the same as that reported by 

 Foster in 1849. It will be referred to again and again in the present 

 volume, for it is largely on the evidence afforded by the presence of such 

 cono-lomerates that the Huronian within this district has been divided b}' 

 later authors into an upper and a lower series. 



The oiitcrops of the above-mentioned formations present on the surface 

 ■a horseshoe-shaped form, which, taken in connection with the dip of the 

 strata, leaves no doubt as to the structure of Republic Mountain. "It is 

 e\'idently the southeast end of a synclinal trough, with Smith's Bay in the 

 center, vinder which, at an unknown depth, all the rocks represented Avould 

 be found, and in the same order." (P. 129.) 



On the opposite side of the ^lichigamme River from Republic the 

 continuation of the Huronian bands was not found where expected, and so 

 a fault was supposed to exist through the bed of the stream. 



The account of the geology of RepubUc Mountain includes descrip- 

 tions of Formations V to XV. At the Spurr mine the formations from XVI 

 to XIX were observed as follows: The lowermost (northerly, since the 

 .beds here dip south) bed at Spurr Mountain is a clay-slate (XV), followed 

 to the south by a soft, brownish, ferruginous rock (XVI), Avhich may be a 

 •decomposed varietv t)f the anthophyllite-schist (XVII) which overlies it. 

 The ferruo-inous rock is soft and is not found in outcrops at this place, 

 but it is seen in a ledge east of Champion, near the Keystone mine. The 



