64 GEOLOGICAL SURVEY OF WISCONSIN. 



have many waters whose medicinal qualities are of great value, but 

 not yet known and appreciated. 



It will be seen that the work of the several parties has been so dis- 

 tributed over the state as to give the most general and correct view of 

 the several rock-formations, and prepare the way for greater progress 

 during the remainder of the time allotted to the survey. The most 

 recent rocks the Drift, Devonian and Upper Silurian came under 

 the special consideration of Prof. Chamberlin ; the Lower Silurian of 

 the Lead region and the country immediately north of it were inves- 

 tigated by Mr. Strong; while the more ancient (Archaean) has chiefly 

 received the attention of Prof. Irving and Maj. Brooks. 



The chemical analyses needed for the survey have been, as hereto- 

 fore, under the direction of Prof. W. "W. Daniells, of the State Uni- 

 versity, who has made a great number of full analyses, and numerous 

 examinations, with a view to the determination of the value of cer- 

 tain mineral products. 



GENERAL GEOLOGICAL MAP. With this report is presented a copy 

 of Mr. Chapman's sectional map of the state, on a scale of six miles 

 to an inch, upon which is represented the geological features so far as 

 they are known up to the date of this report. 



LIST OF MAPS AND SECTIONS ACCOMPANYING THIS REPORT. 



I. PROF. IRVING'S SUPPLEMENTARY REPORT, 1873. 



I. General Map of Northern Wisconsin. Plate 4. 



II. Topographical and Outline Map of the Apostle Islands. Plate 5. 



III. Additional map for Plate 1 Ashland county. 



IV. Map of the Ashland Mining Company's Location. Plate 8. 



V. Showing the occurrence of the Iron Mounds, in the vicinity of Black River 



Falls. Plate 6. 



VI. Showing the Formations in detail along Black river, above the falls. 

 Plate 7. 



II. PROF. IRVING'S REPORT, 1874. 



VII. Map of Townships 5, 6, 7 and 8, in Ranges 8, 9, 10 and 11. 

 VIII. Map of T. 9, 10, 11 and 12, R. 8, 9, 10 and 11. 

 IX. Map of T. 13, 14, 15 and 16, R. 8, 9, 10 and 11. 

 X. Map of T. 17, 18, 19 and 20, R. 8, 9, 10 and 11. 

 X. (2) Map of T. 21, 22, 23 and 24, R, 7, 8, 9 and 10 E. 

 X. (3) Map of T. 25, 26, 27, 28 and 29, R. 5, 6, 7 and 8 E. 

 X. (4) Map of T. 21, 22, 23 and 24, R. 3, 4, 5 and 6 E. 

 X. (5) Map of T. 21, 22, 23 and 24, R. 1, 2, 3 and 4 W. 

 XI. Sections in central Dane county. Plate 2. 



XII. Grouped sections in Dane county. (Double sheet.) Plates 3 and 4. 

 XIII. Sections in Dane and Columbia counties. 



