TABLE OF CONTENTS. xiii 



CHAPTER III.— THE ARCHAEAN ROCKS. 



The Main Arclijean Area — Considered in G-eneral — Line of Junction ■with Potsdam — 

 Unoonfoimability — Topographical Features of tlie Crystallme Rook District — 

 Kind of Rocks — Bedding — Intrusive Granite — Weathering — Strike — Laur- 

 entian — Hua'onian — Economic Importance — Local Details — In Upper Wisconsin 

 VaUey — In Yellow River VaUey — In Black River Valley — Isolated Archman 

 Areas — In General — Table of Isolated Archaean Outcrops — Special Descriptions 



— The Baraboo Quartzite Ranges — The MarceUon Quartz-Porphyry — The 

 Observatory HUl Quartz-Porphyry — The MoundviUe Quartz-Porphyry — The 

 Seneca Quart.z-Porphyry— The Marquette and Berlin Quartz-Porphyries — Com- 

 parison of the Rocks of the Several Porphyry Areas — The MonteUo Granite — 

 The Maiion Granite Areas — Conclusions — The Neoedah Quartzite - 461-524 



CHAPTER IV — THE LOWER SILURIAN ROCKS CONSIDERED IN GENERAL. 



Potsdam Sandstone Seeies — Mendota Limestone — Madison Sandstone — Two 

 Names — Former Investigation — Surface Distribution — Boundary Between Pots- 

 dam and Archsean Areas — Between Potsdam and Lower Magnesian Areas — To- 

 pographical Characters — Lithological Characters and Stratigraphical Arrangement 



— Sections — Analysis of Greensand — Discussion of Anomalous Relations of Cer- 

 tain Portions of the Formation — Beds of Passage — Madison and Mendota Beds — 

 Analyses — Fossils — Economic Contents — The Lower Magnesian Limestone — 

 Name — Surface Extent — Topographical Characters — Lithological Characters — 

 Stratigraphical Arrangement — Sections — Irregular Upper Surface' — Fossils — 

 Economic Contents — The Upper or St. Peters Sandstone — Name — Distribution 



— Topographical Features — Lithological Characters — Thickness — Economic Con- 

 tents — The Trenton Limestone — Relations — Surface Distribution — Topograph- 

 ical Characters — Lithological Characters — BufF Limestone — Blue Limestone — 

 Fossils — Economic Contents — Building Stone — Flux — Galena Limestone — Lo- 

 cal Details — Portage, Wood, Clark and Jackson counties — Juneau and Adams 

 counties — Marquette and Waushara counties, and Green Lake county north of the 

 Fox river — Sauk and Columbia coupties — Dane county. - 525-607 



CHAPTER V — THE QUATERNARY DEPOSITS. 



The Glacial Drift — The Driftless region — Outline of the Driftless Region — Topo- 

 graphy of the Driftless Area — Its Altitude — Surface Features of the Drift- 

 bearing Regions — Linear Topography — Roches Moutonees — Drift HiUs and 

 Ridges — Kettle Range — Materials of the Drift — Bowlders — Gravel — Sand — 

 Clay — Arrangement of the Drift Materials — Amount — Directions of tlie Glacial 

 movement — Table — Origin and Directions of Travel of Erratics and Pebbles — Or- 

 igin of Sand and Clay of Drift — Economic Contents of Drift — Conclusions, 609-636 



APPENDIX — MICROSCOPIC LITHOLOGY. 



BY CHAS. E. WEIGHT. 



Silicious Hornblende Schist — Granite — ArgUlo-chloritic Schist— Hornblende Rook — 

 Syenite — SUicious Chloritic Schist — Chloritic Hornblende Rook — Syenitic Granite 



— Silicious Hornblende Schist- Chloro-siHoious Schist, - - 637-639 



