XIV 



GEOLOGICAL SURVEY OF WISCONSIN. 



PAET IV. 

 GEOLOGY AND TOPOGRAPHY OF THE LEAD REGION. 



BY MOSBS STRONG. 



CHAPTER I. -INTRODUCTORY AND HISTORICAL. 

 Territory Examined in 1873-Plan of Operations -Territoiy Examined in 1874- Pre- 

 vions PubKcations a^d Surveys - Survey of G. W. Featherstonhaugh, 834^35- 

 Surveys of Dr. D. D. Owen in 1839 and in 1847^8- Report of E Darnels, 18o4- 

 Survev of Prof. J. G. Percival, 1854 to 1856 -Report of B. Daniels, 1858 -Report 

 of Profs. HaU and Whitney, 1862 -Report of Rev. J. Murrish, 1872 - Topograpli- 

 ical and Geological Maps and Sections - Barometrical Observations -Infonnation 

 Derived from them - Elevations of Towns and other Localities - Acknowledg- 



645-661 

 ments, 



CHAPTER II. -TOPOGRAPHY AND SURFACE GEOLOGY. 

 General Fbatotes of the CouNTiiT-I)ra«w^c-Situation of the Dividing Ridges or 

 Water-sheds-Streams-Theory of the Formation of the Streams of the Lead Region 



— Process of Erosion - Formation of the Wisconsin River and its Tributaries — Re- 

 sults of the Denudation- Diminution of Water in the Lead Region - Smlong of 

 Streams in Grant County - Causes of the Decrease of Water -Springs and Wells 



— Springs of the West Blue Mound— Inorganic Salts Contained in the Water — 

 Analysis — Prairiji and Forest — Mounds — Sinks — Soil and Subsoil — Absence of 

 Drift— Distribution of the Surface Soil and Rook — Pecrf — Brick Clay — Drift — 

 Gravel Beds — Drift Clay — Erratic Bowlders of Sandstone, 652-667 



CHAPTER HI. -GEOLOGICAL FORMATIONS. 

 Potsdam SawcZsione- Geographical Boundaries — Lithological Characteristics — Section 

 at Lone Rock — Coloring Matter in the Potsdam — Hydraulic Shales — Localities of 

 Fossils — I<oi«cr Magnesian Limestone — Geogr:a.-ph.ioal Boundaries — Lithological 

 Characteristics — Varying Thickness— Localities of Fossils — St. Peters Sandstone — 

 Geographical Boundaries — Lithological Characteristics — Terraces— Knobs— Ripple 

 Marks — Varying Thickness — Upheavals — Concretions — Induration on Exposure 



— Quarries — Trenton Limestone — Geographical Boundaries — Lithological Char- 

 acteristics — Carbonaceous Shale — Analyses — Section — Disappearance of the Blue 

 Limestone — Ores — Minerals — Organic Remains — Galena Limestone — Geograph- 

 ical Boundaries and Area — Lithological Characteristics — Flint — Building Stone- 

 Paleontology — Cincinnati Group — Geographical Boundaries and Area — Litholog- 

 ical Characteristics— Section— Localities of Fossils, - - - 668-688 



CHAPTER IV.— THE LEAD REGION. 

 Boundaries and Area — Explanation of Mining Terms — Mineralogy — Paragenesis of 

 Minerals — Pseudomorphs — Present Condition of the Mines — Section of the Min- 

 ing Openings — Beetown District — Potosi District — Fairplay District — Hazel 

 Green District — Buncome Diggings — New Diggings District — ShuUsburg Dis- 

 trict — Benton District — PlatteviUe District — Whig Diggings — Big Patch Dig- 

 giags — Mifflin District — CentervUle District — Blue River Paint Works — Highland 

 District — linden District — DodgevUle District — Porter's Grove Diggings — Van 

 Meter's Survey — Mineral Point District — Diamond Grove Diggings — Calamine 

 District — Wiota District — Monroe District — Occurrence of Copper in the Lead 

 Region — Statistics of Zinc Ore — Statistics of the Production of Lead Ore in tlie 

 Several Districts for each year since 1861; and the Smelting Facilities — Concluding 

 Remarks, 689-752 



