30 THE VERMILION IRON-BEARING DISTRICT. 



geology of the part of the Vermilion district m the immediate vicinity of 

 Tower. In 1883-1885 Prof R. D. Irving spent several months studying 

 the geology of this district. He was assisted in 1883 by Mr. W. M. 

 Chauveuet and in 1884 by Mr. W. M. Chauvenet and Mr. W. N. Merriam. 

 These studies were continued in 1885 and 1886 by Mr. W. N. Merriam, 

 assisted in 1886 by Mr. W. S. Bayley diiring a portion of the season. In 

 1888 Prof. C. R. Van Hise visited the district, traversing it from end to end. 

 The general results of these trips, which were made for the United States 

 Geological Survey, were embodied in various papers which are referred to 

 under the review of the literature (Chapter II of this monograph) and in 

 manuscript reports that are preserved in the office of the Survey. Various 

 members of the Miimesota Greological Survey have spent parts of or entire 

 field seasons in the district, and their results are published in the reports of 

 the State survey. 



In pursuance of a plan to study each of the Lake Superior iron-bearing 

 districts and make detail reports on them the United States Geological 

 Survey resumed work in the Vermilion district in 1897. This work has 

 been imder the general charge of Prof. C. R. Van Hise. The geologists in 

 the field were Messrs. W. S. Bayley, C. K. Leith, and J. Morgan Clements. 

 The field work continued through the field seasons of 1897, 1898, 1899, 

 and 1900. Professor Van Hise was in the district for short periods during 

 tlie different seasons, and in 1899 he spent a large part of the season in 

 active field work. Mr. Bayley spent the seasons of 1897 and 1898 in the 

 field; Mr. Leith spent the seasons of 1897, 1898, and 1 899 ; and Mr. Clements 

 (the writer) was present every year, remaining tliroughout the entire season. 



In preparing this report the writer has, of course, made use of the 

 material obtained by the other members of the survey, and is very greatly 

 indebted to them for the assistance given by their carefully prepared notes. 

 He is, however, chiefly under obligations to Professor Van Hise, who, in 

 the first place, gave him the opportunity to prepare the report, and who 

 has ever been ready to assist him both in the field and in the office. 



The mining men of the Vermilion district have, almost without exception, 

 shown high apprecia.tion of the work done in other districts by the United 

 States Geological Survey, and have rendered all legitimate assistance 

 within their power during the jjrogress of the work. The Minnesota Iron' 

 Company, under the presidency of Mr. D. H. Bacon, and later of Mr. T. F. 



