THE EASTERN AREA. 421 



tinet series. Without repeating- tlie argument in detail wliicli is given in 

 anotlier place (Chap, ix, Sec. ii), it is only necessary to mention the salient 

 tacts which show that the same relations prevail between the three great 

 series of rocks east of tlie Little Presque Isle that are found to the west. 



The schists, gneisses, and granites, niingle«l with occasional eruptive 

 greenstones, constitute a coniplex of rocks in the southern part of the area 

 mapped on PI. xiii. There is no imiformity in the strike and dip of these 

 schists and gneisses. Within a few rods the strike of the rock may change 

 90°. The dip is also in all directions, the only constant thing being that 

 tke angles of inclination are generall)- high, indicating that the rocks 

 have probably passed through a period of extreme folding. Taken as a 

 whole, the schists and the granites, the latter including gneissoid granites, 

 are in tolerably distinct large areas; biit along the lines of contact the two 

 classes of rocks are mingled in inextricable confusion, and included in the 

 large granite area west of Gogebic lake, in several places, exposures of 

 hornblende-schists and (^hlorite-schists are found. Lithologically, all the 

 rocks belonging in this complex are either massive eruptives or crystalline 

 schists, in which the extreme of foliation and crystalline character is found. 

 Nowhere is there any plain evidence, unless foliated and schistose structure 

 is so considered, that any of them are of fragmental origin. Thus in all 

 respects this complex sei'ies is seen to be like the basement rocks upon 

 which the Penokee series to the west rests, and it is therefore, a continu- 

 ation of them. 



In strong contrast to this complex are the rocks under discussion. 

 While their strikes vary somewhat as the belts bow north oi- south, their 

 general course is east and west. Their dips are generally to the north, Ijut 

 in some cases are to the south. This variation of dip has to do with the 

 relation of the belts of rocks inclnded in the series among themselves, but 

 does not aifect their relations to the surrounding rocks. We have here, then, 

 as in the western area, a series which is north of and separable from the 

 complex to the south by a fundamental ditterence of strike. Also the 

 series under discussion is seen to be essentially a mingled nonfragmental 

 and fragmental set, which is for the most part so little changed that its 

 origin is certainly determinable. 



