U) THE PENOKEE lEON-BEAEING SERIES. 



series from the Potato river eastward, to the Michigan boundal'}' at the 

 Montreal river. ^ 



conover (1878). —Ill the Slimmer of 1878, Mr. A. D. Conover made a some- 

 what extended trij) through the comitry between tlie Montreal and Bad 

 rivers for the purpose of filling up certain gaps left by work of previous 

 years. His routes were mostly north of our present district, the upper 

 portion of whicli they touched, however, in T. 44 N., R. 2 W., and T. 45 N., 

 R. 2 W., Wisconsin.^ Mr. Couover's results were embodied in my final 

 report^ on the eastern lake Superior district. 



Rominger. (1882).— Dr. C. Rominger, acting in his capacity of State geol- 

 ogist of Michigan, made a study of the region between the Montreal river 

 and Gogebic lake in the summer of 1882, spending three weeks in that 

 field. While Dr. Rominger's results have not yet been published, they are 

 embodied in a manuscript report of which he has been kind enough to 

 furnish me a copy. 



Van Hise (1884-1887).— The particular investigation upon which the present 

 volume is especially based was begun in 1884. The object was the 

 extension of the detailed work done by the Wisconsin survey east- 

 wai'd froni the Montreal river to lake Gogebic. Nothing .very definite 

 was then known with regard to the latter district save that there 

 existed in it, contrary to Foster and Whitney's reports, an eastward 

 continuation of the Penokee Iron series. It was then thought that a 

 single season's work would be sufficient, with the aid of the published 

 results of the Wisconsin Survey and of my own familiarity with the coun- 

 try west of the Montreal river, to furnish the material needful for such an 

 account of the Penokee series as it would be desirable to inchide in a final 

 report on the Huronian of this part f)f the lake Superior region. Accord- 

 ingly, to Prof C. R. Van Hise, who had already acquired a tliorough 

 acquaintance with the original Huronian of the north shore of lake 

 Huron and with the iron-bearing series of the Marquette and Menominee 

 districts, was assigned the work of making a detailed survey of the district 



' Annual Report of the Wisconsin Geological Sur\ey for the year 1877, pp. 3S-28. See also Geol. 

 of Wis., vol. Ill, pt. Ill, p. 56, atlas PI. x.wi. 



'Annual Report of the Wisconsin Geological Survey for the year 1878, pp. 5-0. 

 'Geol. of Wis., vol. Ill, pt. Ill, ]ip. 53-214. 



