170 THE MARQUETTE lEON-BEAlilNG DISTiaCT. 



niiiv be tn-atcd tt)}^'ether, since tliev are alike botli in macro.scopic and in 

 microsco])ie cliai-acters, and so far as can l)e learned they bear exactly the 

 same relatidns to the surrounding sedimentaries and crystallines. The 

 easternmost ot" tlu' two areas is north of the Mona schists and bevond the 

 limits of the map (Atlas Sheet IV). It extends northward nearly to the 

 lake shore, and westward until it connects outside the limits of our work 

 with the eastern liml) of the second area. This second area begins at 

 the western side of the Kitclil formation and extends westward beyond the 

 district treated in this paper. (_)u the south it is boi-dered by the Alg-onkian 

 beds of the IMarquette area, and on the north by the slates aud quaitzites 

 of the Arvon district. 



The g-ranites, whether massive or gneissoid, form knobs with rounded 

 and smooth surfaces, where thev have been exposed clearly to view bv the 

 removal of their forest covering. At man\' localities these are isolated from 

 one another bv stretches of glacial or lake sands. At others a number of 

 knobs together form large, rugged, boss-like masses, ha-v-iug- as many inde- 

 ]>endent eminences as there are individital knobs comprising the main one. 

 The hills never assume the dignity of mountain peaks. The surface fea- 

 tures of the area underlain by the granite are thus essentially similar to 

 those of the green-schist area. There is a diifereuce, however, that is 

 usuallv recognizable in those portions of the district where ledges ai*e 

 abmidant. In the areas of green schist the surfaces of the ledges are 

 usuallv rough and broken: in the areas of granite the surfaces are smooth 

 as a result of glacial action, so that, whereas the bare tops of hills and the 

 bottoms of stream channels in the greenstone-schist are rough and uneven, 

 in the granite the>' are comparativelv even and smooth. (See PI. VI.) 



RELATIONS TO AD.rACENT ROCKS. 



The relations of the granites to the green schists with which thev are 

 in contact have already been mentioned. The granites and their accom- 

 panying gneisses are younger than the schists. They are, however, older 

 than the fragmental beds above the schists, since none of their dikes intersect 

 these, even when the granitic rocks are in contact with the sedimentary 



