284 THE MARQUETTE IRON-BEARING DISTRICT. 



said, iu sec. 28 the ridge branches into two parts, one of which extends 

 west about a mile. The main beh swings totlie north into sec. 21, T. 47 N., 

 R. 26 W. Here there are again numerous huge ledges of the quartzite. 

 Following along the course of the belt to the northeast, between sees. 22 

 and 23 there are again numerous large exposures. Continuing to the north, 

 the formation has a position between the Wewe slate and the Siamo 

 slate. The quartzite, being the more resistant rock, occupies the higher 

 lands, between lower lands to the south and to the north. In the valley 

 of Carp River the outcrops are, however, less numerous than to the 

 southwest, although sufficiently abundant to show that the belt is certainly 

 continuous to sec. 36, T. 48 N., R. 26 W. From this point exposures are 

 not abundant until the quartzite east of Teal Lake is reached, where again 

 they are numerous. From this place they extend almost continuously 

 along the ridge to sec. 33, T. 48 N., R. 27 W. From here west to Michi- 

 gamme the outcrops are not abundant, but are found at a number of places 

 close to the Archean. 



Where the formation appears south of the Negaunee iron formation, 

 in sees. 34 and 35, T. 47 N., R. 26 W., there are ledges of quartzite and 

 conglomerate. West for some distance the topographic features are given 

 by the Archean to the south and the jaspery iron formation to the north, 

 so that the quartzite usually occupies a valley between these two formations, 

 but with frequent exposures in sees. 31, 32, and 33. West of the Volunteer 

 mine the formation appears as a conglomerate below the iron-bearing 

 member. In sec 30, to the north, there are a number of large and typical 

 ledges. West of this place the quartzite is again in the valley between 

 the Archean to the south and tlie iron formation to the north, there being 

 only a few outcrops. The rock is found facing the granite near the center 

 of sec. 28, T. 47 N., R. 27 W., and somewhat unusual slaty phases, inter- 

 bedded with amygdaloids, are found near the top of the formation in 

 sees. 27 and 28. Several exposures are found in sec. 19, west of which are 

 no outcrops until the vicinity of Humboldt is reached, where exposures 

 are again found south of the iron formation. The remaining outcrops are 

 considered iu Chapter IV. 



