22 THK OEYSTAL FALLS IRON-BEAKING DISTRICT. 



Survey. At tlie .same time, in connection witli the topographic work, a 

 reconnaissance geological survey was made. 



The following is a list of those who took geological notes for this 

 survey: Andrews Allen, A. H. Brooks, W. S. Bay ley, J. P. Channing, E. T. 

 Eriksen, J. R. Finlay, F. J. Harriman, F. T. Kelly, E. B. Matthews, E. R. 

 Manrer, J. A. McKim, F. W. McNair, W. N. Merriam, and H. F. PhiUips. 



Tlie following season was devoted to a detail study of the iron-bearing 

 belts which had been outlined by the reconnaissance. This detail work in 

 the western part of the district was prosecuted by parties in charge of W. N. 

 Memam, and in the eastern part of the district by parties in charge of 

 H. L. Smyth. When they ceased work, the two areas mapped were sepa- 

 rated in the north by about 12 miles, and a narrow belt separated the 

 mapped areas to the south. During the season of 1894, under the direc- 

 tion of Professor Van Hise and assisted by Gr. E. Culver, and during part 

 of the season by S. Weidman, I was engaged in completing this unfinished 

 work for the United States Greological Survey, preparatory to connecting 

 this district with the Menominee iron-bearing district to the southeast. This 

 work was carried on in 1895 by Dr. W. S. Bayley, S. Weidman, and myself, 

 and the mapping of the district extended as far as the Menominee district. 



Mr. H. L. Smyth has written Part II of the pi-esent report, covering 

 the portion of the district which was worked by his party. My description 

 of the part of the district worked by me is based largely on my own obser- 

 vations. Many of the facts of field occurrence, liowever, mentioned in the 

 following paper were observed and recorded by the several men mentioned 

 above, and were subsequentl}' verified by my own observations in portions 

 of the area surveyed by myself, and by visits to localities in other portions. 



The topography of the greater portion of the district was taken by the 

 members of the Lake Superior Survey. The remainder we owe to the 

 topographical division of the United States Greological Survey. The areas 

 covered by the respective organizations are shown on the sketch map below 

 the topographical map (PI. II). 



MODE OF WORK. 



As explanatory of the locations given in the paper, it is perhaps not 

 out of place to give a brief description of the plan of work followed by the 

 Lake Superior Division of the United States Geological Survey in this as 



