558 THE MAEQUETTE IRON-BEARING DISTRICT. 



in the west liulf of sec. 25, T. 47 N., R. 27 W. (Atlas Sheet XXIX). The 

 conglomerate at this place grades downward into a schist which is scarcely 

 distinguishable from the Palmer gneiss, with which it is in contact. The 

 next contact to the west is in sec. 28, T. 47 N., R 27 W. (Atlas Sheet XXV). 

 Here the phenomena are similar to those south of Summit Mountain. 

 West of this place no actual contacts between the quartzite and the Base- 

 ment Complex are found until the end of the Republic trough is reached 

 (Atlas Sheet XI), where again a conglomerate hangs with visible contact 

 upon the flank of the granite, bearing well-rounded waterwom bowlders 

 fi-om it. 



At the north side of the Lower Marquette series, and near the east end 

 of the district, there is exposed a magnificent basal conglomerate about 3 

 miles west of Marqixette, north of Mud Lake (Atlas Sheet XXXYI). Here 

 the rocks adjacent to the Mesnard quartzite are the Mona schists, and these 

 peculiar rocks are largely found as deti'itus in the basal conglomerate. 

 Here also are found granite bowlders similar to the granite masses which a 

 short distance. to the north intrude the volcanics of the Northern Complex- 

 The next known contacts to the west are at the base of the quartzite east 

 and west of Teal Lake (Atlas Sheets XXVII and XXX). Here, at a half 

 dozen places, contacts are found, each of the conglomerates having, as 

 usual, as their abundant detritus, the immediately subjacent material at the 

 particular locality. At one place the relations are such that the layers of 

 the conglomerate cut across the foliation of the subjacent schist at an 

 acute angle (fig. 14). Still farther west, in sec. 30, T. 48 N., R. 28 W., the 

 quartzite is found in visible contact with the granite at a number of places 

 (Atlas Sheet XVIII), and again its most abundant material is exactly like 

 the subjacent granite. In some of the places the basal rock is a con- 

 glomerate, in others a " recomposed " granite — i. e., it is composed of the 

 separate minerals of the underlying granite. West of this point the only 

 actual contact known is north of the Michigamme mine, although at a 

 number of places strongly feldspathic quartzites occur near the granite. 



We thus have more than a score of localities, scattered about the entire 

 area covered by the Lower Marquette rocks, where occur great basal 

 conglomerates, a number of which rest with visible contact upon the rocks of 



