UNCONFOKMITY AT 15ASE OF LOVVKK MARQUETTE SERIES. 557 



arbitrary sulxlivision is most ('onspicTious in the (juartzitc which occurs oast 

 of Teal Lake. (Atlas Slieet XXX.) 



UNCONFORMITY AT THE BASE OF THE LOWER MARQUETTE SERIES. 



As evidence of the iincoiiforiuity Ix-twecn the liovver Maniuette series 

 and the liaseineiit Complex is found all alonj;' the lower ])art of tlie trans- 

 gression quartzite, the; j)h(^nomena showing unconformity are mentioned here 

 rather than in connection with the s(!|)arate formations among which this 

 belt is divideil. However, for the exact locations and detailed descriptions 

 of particular contacts it will be necessary to refer to the desci-iptions of the 

 individual formations. 



At the east end of the south side of the Manpiette district there are 

 numerous localities from Lake Superior to west of Lake Mary where a 

 granite-conglomerate is found bearing numerous l)owldei's of granite, gneiss, 

 and schist, identical with the rocks c<»nstitutiug the Basement (Joniplex 

 innnediately adjacent. At .several of these localities the actual contact 

 between the Mesnard quartzite and the Basement Complex is seen. Some 

 distance farther to the west the Marquette formations reach the Pleisto- 

 cene sand plain, the Basement Complex not being exposed. Passing this 

 area, we next find in the ]\[arquette series two islands of the Basement 

 Complex in sees. 22 and 23, T. 47 N., R. 26 W. (Atlas Sheet XXXV). 

 Here are found most magnificent exposures of great bowlder-conglomerate 

 and recomposed granite, resting with visible conta(;t u[)on the Basement 

 Complex and composed of material mainly derived from it (fig, 11). Li 

 sec. 23 the i)redominant rock of the Basement Complex is a peculiar white 

 schistose granite, and the predominant bowlders of the conglomerate are 

 of the same character. South of the Cascade range, there are again a 

 number of localities from sees. 34 to 32, T. 47 N., K. 2C W. (Atlas Sheets 

 XXXII and XXXV), where are basal conglomerates, the great bowlders 

 again being mainly identical with the adjacent granites, gneisses, and schists 

 of the Basement Complex. In this area in the Basement Complex are 

 some peculiar basic eruptives, and these rocks are found in the form of 

 well-rounded waterwom bowlders in the conglomerate. Toward the west, 

 the next exposure of basal conglomerate is south of Sununit Mountain, 



