174 THE PENOKEE IKON BEARING SERIES. 



Directly south of the Pahm mine (Sec. U, T. 47 N, R H W., Mich- 

 igan), upon a raih-oad spur, and about oue-fourtli of a mile to the west along' 

 the same track, are seen contacts of the quartz-slate and the ;:;-ranite. The 

 basal conghjmerate is a mere fticing. The fragmental material also pene- 

 trates the granite in cracks which existed at the time of the deposition of 

 the quartz-slate. Some of these seams of conglomerate extend from a foot 

 to several feet into the granite. The pebbles of the conglomerate include 

 jasper, "chert, and quartz, as well as granite. The chert was probably 

 dei'ived from the Clierty limestone formation, while the jasper, perhaps, 

 came from an iron-bearing formation belonging with the Cherty limestone 

 series, but now wholly removed by erosion. 



Flcj. 7. --Large-scale drawing; nl" junction of qu-irt/.-slate and sreeu schists at Potato river. 



Sralu; 1 iucli^o ti-il. 



A contact between the Quartz-slate and the granite, very similar to 

 that at the Palms, occurs just south of the Aurora mine. 



