VI 



CONTENTS. 



CHAPTER II. 



Description op the Geological Formation of Red Cedar, Wapsinonox, and part op the 

 Lower Iowa Rivers, belonging to the Devonian Period of Europe and the Hamilton 



Corniferous Groups and Onondaga Limestone of New York, . . . .77 



Sect. I. Its Lithological Character and Geological Aspect, illustrated by Wood-cuts, . . 77 



Sect. II. Its Paleontology, illustrated by Steel-Plate Engravings, partly medal-ruled, . 78 



Sect. III. Its Mineral Contents, ........ 80 



Sect. IV. Its Range, Extent, and Bearing, ....... 80 



Sect. V. Its Physical and Agricultural Character, illustrated by Wood-cuts, . . .81 



Sect. VI. Its Local Details, ......... 82 



CHAPTER III. 



Description op the Carboniferous Rocks op Iowa, including that of a Coal-field west of the 

 Mississippi, lying partly in Iowa, and partly in Missouri, the extent and limits now for the 

 first time defined in this Report, and laid clown on the large Geological Map, accompanying 

 it; with descriptions of minute, connected sections, passing in two directions through the 

 heart of this Coal-field; one series along the Valley of the Missouri River; and the other 

 series up the Valley of the Des Moines, ....... 90 



CARBONIFEROUS LIMESTONE AND COAL-MEASURES. 



A. Lower Series of Carboniferous Limestone, ....... 90 



B. Upper Series of Carboniferous Limestone, ....... 90 



Sect. I. Their Lithological Character, and Geological Aspect, illustrated by Wood-cuts, . 90 

 Sect. II. Their Palaeontology, illustrated by Steel-Plate Engravings, . . .94 



Sect. III. Their Mineral Contents, . . . . . . . .97 



Sect. IV. Their Range, Extent, and Bearing, illustrated by Sections and Map, . . 98 



Sect. V. Their Physical and Agricultural Character, illustrated by Wood-cuts, . . 100 



Sect. VI. Their Local Details, ........ 101 



C II A P T E R I V. 



Description op the Geological Formations of the Interior of Wisconsin and Minnesota. 



Sect. I. Their Lithological Character and Geological Aspect, illustrated by Wood-cuts, . 141 



Sect. II. Their Palaeontology, ........ 145 



Sect. III. Their Mineral Contents, . . - . . . . .145 



Sect. IV. Their Range, Extent, and Bearing, illustrated by Sections and Map, . . 147 



Sect. V. Their Physical and Agricultural Character, illustrated by Wood-cuts, . . 148 



Sect. VI. Their Local Details, .• . . . . . . . .151 



CHAPTER V. 



On the Age, Character, and true Geological Posttton of the Lake Superior Red 



Sandstone Formation, ......... 187 



CHAPTER VI. 



Incidental Observations on the Upper Missouri River, and Descriptions of the 

 Geological Formation of the Mauvaises Terres (Bad Lands) of Nebraska 

 Territory ; developing a new feature in the Geology of the West, and disclosing the former 

 existence of many New Species and Genera of Animals; also, New Races of Ruminating 

 Pachyderms, and Omnivorous Ungulate Ruminants, which roamed high up in the Valley of 

 the Missouri, at the dawn of the Tertiary Period, 



