12 THE PENOKEE IKON-BEARING SERIES. 



thrown upon the structure of the region by mining- operations, and examin- 

 ing again many of the more important exposures. Among other things, 

 tlie eastern termination of the Gogebic range had not been ascertained, ])ut 

 exph^ring operations enabled Prof Van Hise to determine that the horizon- 

 tal Eastern sandstone overlies the Penokee-Grogebic series just west of 

 Gogebic lake. Later in the same season, August 15, in company with 

 Prof Van Hise, I visited the district to examine ^^ersonally the numerous 

 interesting localities which had been discovered or developed by mining 

 since the previous season. . 



During this season's field work was noticed the remarkalile association 

 between the ores and an altered greenstone, which the miners called eitlier 

 soapstone or diorite dike, and the conclusion was reached that between tlie 

 two there must be some genetic connection. Mr. J. Parke Channing, 

 mining inspector for Gogebic county, was induced to investigate the rela- 

 tions of the ore bodies and dike rocks. This woi'k he did during the latter 

 pai-t of the season, reaching some very interesting conclusions. Mr. Cliau- 

 ning has also given a good deal of attention to all new points sliown liy 

 mining development of the region up to the present date, and has, with 

 great kindness, promptly furnished us information as to them. 



In this connection should be mentioned the fact that Mr. J. M. Long- 

 year, who is in charge* of the lands of the Lake Superior and Portage Ship 

 Canal company, a large part of which lie between lake Gogebic and the 

 Montreal river, kindly allowed us, after the work of 188fi was completed, 

 to make use of the notes as to locations of exposures obtained by parties of 

 woodsmen under his direction. These parties, crossing each section a 

 number of times, made notes, not merely as to timber and topography, liut 

 also located and collected specimens from every exposure encountered, 

 with a view to discovering indications of the existence of iron ore deposits. 

 Going over these notes and specimens carefully, Prof Van Hise has been 

 able to add t(^ the information obtained by himself Just how hir his o\vn 

 studies have extended between lake Gog'ebicand the Montreal river will 

 be seen from his routes of travel indicated on the accompanying maps. 



