TABLE OF CONTEXTS. xiii 



CHAPTER III. THE ARCH.EAN ROCKS. 



The Main. Arch-jean Area Considered in General Line of Junction with Potsdam 

 Unconf 01 inability Topographical Features of the Crystalline Rock District 

 Kind of Rocks Bedding Intrusive Granite Weathering Strike Laur- 

 entian Huronian Economic Importance Local Details In Upper Wisconsin 

 Valley In Yellow River Valley In Black River Valley Isolated Archtean 

 Areas In General Table of Isolated Archffian Outcrops Special Descriptions 



The Baraboo Quartzite Ranges The Marcellon Quartz-Porphyry The 

 Observatory Hill Quartz-Porphyry The Moundville Quartz-Porphyry The 

 Seneca Quartz-Porphyry The Marquette and Berlin Quartz- Porphyries Com- 

 parison of the Rocks of the Several Porphyry Areas The Montello Granite 

 The Marion Granite Areas Conclusions The Necedah Quartzite - 461-524 



CHAPTER IV THE LOWER SILURIAN ROCKS CONSIDERED IN GENERAL. 



POTSDAM SANDSTONE SERIES Mendota Limestone Madison Sandstone Two 

 Names Former Investigation Surface Distribution Boundary Between Pots- 

 dam and Archaean 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 counties 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- 

 beaxing Regions Linear Topography Roches Moutonees Drift Hills and 

 Ridges Kettle Range Materials of the Drift Bowlders Gravel Sand 

 Clay Arrangement of the Drift Materials Amount Directions of the 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. WRIGHT. 



Silicious Hornblende Schist Granite Argillo-chloritic Schist Hornblende Rock 

 Syenite Silicious Chloritic Schist Chloritic Hornblende Rock Syenitic Granite 



Silicious Hornblende Schist Chloro-silicious Schist, ... 637-039 



