THE SOUTHERN COMPLEX. 105 



separating them g-radually .swiugiug away lVi>in the PeiKikee rocks, leaving 

 a wedge of green schist between the latter and the gneissoid granites. The 

 eastern end of this green schi.st area also runs to a sharp point, the granite 

 being found .south of it five or six miles west of the point at which it reaches 

 the Penokee rocks. The distribution of the granite east and west of the 

 schists suggests that the two areas . are, connected. If this is the case, the 

 Western green scliist is an isolated area bounded on the south by the 

 granite and on the north by the Penokee series. 



The second granitic area extends immediately south of the Penokee 

 series, from Sec. 35, T. 46 N., R. 2 E., Wisconsin, to about the middle of 

 T. 47 N., R. 4G W., Michigan. At the latter point ,tlie schists again apj)ear, 

 and like those to the westward, widen out in a wedge-shaped area, leaving 

 the granite as the southernmost known rock for tpiite a distance south of 

 the second schist area. This granite area has many exposures in such close 

 proximity to those belonging to the Iron-bearing series for the distance 

 mentioned as t(j leave no doid)t that it is here the basement upon which the 

 former rests. While it is called a granite area, it contains large masses of 

 rock of a jnore basic character, including both syenites and altered gabbros, 

 the relations of which to the granites will be referred to subsequently. 



East of this Central granite follows another schist area, running from 

 near the middle of T. 47 N., R. 46 W., Michigan, to within a mile and a^ 

 half of the east side of T. 47 N., R. 43 W., Michigan. The schists are in 

 places nearly three miles wide, but throughout the entire distance, with the 

 exception of two or three miles in the east half of T. 46 N., R. 44 W., Mich- 

 igan, granitic rocks are known to lie to the south. 



East of this Eastern green schist again appear granites and gneissoid 

 granites wlfich south of the Penokee rocks extend to Gogebic lake. What 

 has been said about the connection of the Central granite and Western 

 granite applies even more strongly to the Central and Eastern granites, 

 which would perhaps have been connected if the countrj- had been ti'a versed 

 a little farther to the south. The boi;ndaries between the Eastern srreen 

 scliist and the adjacent granites are of a most irregular nature, and quite often 

 in the same exposure both granitic and schistose rocks are found. The 

 significance of these facts will l)e discussed latin-. 



