44 GENERAL INDEX. 



Adams Co., (A. H. WOBTHEN) IV.43-61 



Physical features IV.43 



" Section of strata IV, 44 



Quaternary deposits 1V.46; VIII,8,15 



" Coal measures IV, 48 



St. Louis group IV, 51 



Keokuk group IV, 53 



Burlington group IV,55 



Kinderhook group IV, 57 



Economical Geology, (coal, building stone, limestone for lime, fire 

 and potter's clay, clay and sand for brick, soil and timber) IV, 58 



Alexander Co., (A. H. WOBTHEN and H. ENGELMANN) 111,20-32 



Physical features 111,20 



Section of strata Ill, 21 



Tertiary System 111,21 



" Black Slate, Hainilton.and Corniferous gr 111,22 



' ' Onondaga group Ill, 23 



" Clear Creek Limestone 111,24 



" Lower Helderberg Limestone 111,25 



Cincinnati group 111,26 



Thebes Sandstone and Shale 1,139; 111,27 



' Trenton Limestone 111,28 



" Economical Geology (lead and iron ores, building stone and 



marble, clay and sand, road material, agriculture) 111,19 



Bond Co.. (G. C. BBOADHEAD) VI.128-134 



" Physical features, timber and soil VI, 129 



Sections of strata VI, 128-133 



" Quaternary deposits VI, 130 



Coal Measures VII, 131 



" Economical Geology, (coal, building material, fire clay, water, soil 



and agriculture) VI, 134 



Boone Co., (JAMES SHAW) V.95-103 



Physical features V, 95 



" Section of strata V,97 



" Quaternary deposits V,97 



Cincinnati shales V,98 



Galena limestone V,99 



Blue limestone V, 100 



Economical Geology, (building stone, lime, bog-iron ore, copper in 



the drift, chalybeate springs, sand and clay, peat, agriculture) V.100 

 Indian relics V.102 



Brown Co.. (A. H. WOBTHEN) IV.62-74 



Physical features IV, 62 



Sections of strata r. IV, 63, 65, 70 



' ' Quaternary deposits IV, 63 



' ' Coal measures IV, 65 



St. Louis group IV, 68 



Keokuk group IV.69 



Economical Geology, (potter's clay, fire clay, building stone, limestone 

 for lime, sand and clay for brick, soil and agriculture, mineral 

 springs and analyses) IV.70 



Bureau Co., (JAMES SHAW) V, 167-184 



. ' ' Physical features V, 167 



" Sections of strata V.169-180 



Quaternary deposits V.170 



" Coal measures V.172 



