CONTENTS. 
Intropuctory LETTER 
INTRODUCTION, being a Synopsis of Practiell Sosahte, and Barntive of vais, 
CHAPTER I. 
DESCRIPTION OF THE GEOLOGICAL FoRMATIONS OF THE UPPER MISSISSIPPI, BELONGING TO THE 
SILURIAN Perron, lying between the Great Lead Region, south of the Wisconsin River, and 
the Falls of St. Anthony, on the north, and from the Falls of the eastern tributaries of the 
Mississippi River on the east, towards the sources of its western confluents on the west; treated 
of under the following heads, é : ; ‘ 
FORMATION I. 
Lower SANDSTONE OF THE Upper MIssIssipri, . 
Sect. I. Its Lithological Character and Geological hack, sheeted be Wood- idly 
Sect. IT. Its rest illustrated % medal-ruled Steel-Plate Engravings, from the original 
Spec 
Sect. IIT. Its Mineral fitout, 
Secor. IV. Its Physical and Agricultural ‘Cnigasex: ithineestad by Wotdcedls, 
Sect. V. Its Range, Extent, and sii illustrated MA Sections and ae 
Sect. VI. Its Local Details, 
FORMATION II. 
Aj oBecG. 
Lower Macnestan Limestone or THe Upper MISSISSIPPI, 
Secr. I. Its Lithological Character, and Geological Aspect, iHasthitid by Wood- ents 
Sect. II. Its Paleontology, illustrated by Steel-Plate Engravings, : 
Srcr. III. Its Mineral Contents, 
Sror. IV. Its Physical Features, and heriouitars! Ghatanter, iitustrated by Wonddeta 
Seor. V. Its Range, Extent, and oe illustrated by Sections and se ; 
Secor. VI. Its Local Details, ; 
Sr. Perer’s SANDSTONE, 
FORMATION IIL 
 S. ¥. 
St. Perer’s Sueit Limestone, 
Secor. I. Its Lithological Character, 
Srcr. IT. Its Pdaxwigics Tigatinted by Po a Steel-Plate Bngrvings, 
Secor. III. Its Mineral Contents, ‘ 
Secr. IV. Its Physical and Agricultural Character, i hastested by a 
Sect. V. Its Range, Extent, and Bearing, illustrated by Sections and Map, 
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