192 TUB MARQUETTE lliON-BEAliING DISTRICT. 



abundant. As the work in the Smitlieni Complex progresses it is probable 

 that the schist areas and granite areas will be differentiated from each 

 other, and that a correct map will show large granite areas surrounded by 

 schistose rocks and separated from each other b}- areas in which schists are 

 largely ))rcdomin;int. 



COMPARISON WITH NORTHERN COMPLEX. 



As conii)ared with tiiat portion of the Northern Complex studied, it 

 is found that the southern area contains fewer greenstone-schists. More- 

 over, in the southern area hornblendic and micaceous gneisses and schists 

 are abundant, whereas in the northern area the}' are absent. The granite 

 is intrusive in these schists, and also in the few greenstone-schists present. 

 The relations of the greenstone-schists to the hornl)len(lic and micaceous 

 cues are not known, but it is thought" ])robal)le that the latter ai-e older 

 than the former, and that this fact would account for their absence in the 

 northern area, where, if they ever existed, they must be buried beneath 

 the tuffs and lava flows that have produced the schistose gi-eenstones. 



THE SCHISTS. 



The schists of the Southern Complex comprise hornblendic and 

 micaceous schists and greenstone-schists similar to the greenstone-schists of 

 the Northern Complex, granite-gneisses, and the Palmer gneisses, which, 

 because thev are so closely allied to the granite-gneisses are discussed with 

 the latter rocks. 



The l)est exhibition of the various hornblendic and micaceous schists 

 is in the area lying southeast of Lake Michigamme and s^)uthwest of 

 Champitm, constituting the northeast (luarter of T. 47 N., R. 30 W. (Atlas 

 Sheet IX). The district is covered with small knobs and lai-ge hills with 

 bare tops, on whicli the relations of the schists and the granite may be 

 easily studied. Occasionally a knob may consist exclusively of granite or 

 of the schists, but usually both schists and granites are found in it, the 

 granite often occupying the higher parts. The schists include both horn- 

 blendic and micaceous kinds, of which the latter are the more common, 

 though the formiT arc not rare. The micaceous varieties ai-e well banded 

 with light and (l,iri< laxers, measuring from a line or so to several inches in 



