562 



EDWARD STEIDTMANN 



Gogebic district. Both are classified by them as Middle Huronian. 

 The succession in the Marenisco range, they state, is as follows: 



Keweenawan 



Huronian 



Igneous contact 



Middle Huronian 

 (Animikie) 



Diabase 



Intrusive granite 

 Intrusive greenstone 

 Slate 



Extrusive lavas 

 Iron formation 

 Quartzite and graywacke 



Unconformity 

 [Northern Area — granite and greenstone 

 Archean < Southern Area — mica schist, green schist, and amphibolite 

 [ (may be Huronian) 



The Marenisco range lies three to twelve miles south of and is 

 parallel to the Gogebic range. 



Allen and Barrett^ describe the Turtle iron range about eighteen 

 miles southeast of and parallel to the Gogebic range of northern 

 Wisconsin and Michigan. The succession of the range as stated 

 by the authors is as follows : 



Algonkian: 



Keweenawan 



Huronian 



/ Intrusive diabase 



\ Granite and greenstone 



Middle Huronian 

 (Animikie) 



Unconformity ? 



Lower Huronian 



Granite 



Effusive 



Agglomeratic and ellipsoidal 



Greenstone 



Black slate and graphitic schist 



Iron formation 



Quartzite and mica schist 



Mica schist (may be Middle 

 Huronian) 



Dolomite and dolomitic quartz- 

 ite 



Quartzite 



Unconformity 



Archean : 



T7 ^. f Mica schist and 

 Keewatm jg^een schist 



^ R. C. Allen and L. P. Barrett, " Geologj^ of the Turtle Range," Mich. Geol. Sun. 

 Pub. 18 (1915), Geol. Ser. 15, pp. 86-109. 



