52 GENERAL INDEX. 



Massac Co.. Tertiary and Post-Tertiary formations 1,447 



Chester group 1, 438 



St. Louis group 1,435 



' ' Economical Geology, (lead and iron ores, fluor spar, building mater- 

 ials, agriculture) 1, 452 



Indian remains 1,455 



McDonough Co., (A. H. WOBTHEN) V.253-2C5 



Physical features V.253 



Sections of strata : V.254-261; VII.24 



Quaternary deposits V.254 



Coal measures V.255; 1,228 



" St. Louis group V.260 



Keokuk group V, 261 



" Economical Geology, (coal, flre clay, iron ore, building materials, 



agriculture) V.261 



McHenry and Lake Counties (HENBY M. BANNISTEB) IV, 126-135 



Physical features IV.126 



Sections of strata IV.129; VIII.12 



" Quaternary deposits IV, 129 



Niagara group IV.131 



Cincinnati group IV, 132 



Galena limestone (?) IV, 133 



Economical Geology, (building materials, peat) IV, 133 



McLean Co. See Tazewell, McLean, Mason and Logan Counties. 

 Menard Co. See Cass and Menard Counties. 



Mercer Co.. (H. A. GBEEN) IV.301-312 



Physical features IV, 301 



Sections of strata IV.303-307 



Quaternary deposits IV, 302 



Coal measures IV, 302 



Kinderhook group IV.307 



Economical Geology, (building stone, lime, coal, agriculture) IV.307 



Monroe Co., (A. H. WOBTHEN) V.266-285 



Physical features V.266 



Section of strata (longitudinal) V.269 



Sections of strata (vertical) 1,112; V.270-278 



Quaternary deposits V.267 



Coal measures V, 270 



Chester group V.272 



St. Louis group V.274 



Keokuk group V, 277 



Burlington group V, 278 



Trenton group V, 279 



Economical Geology, (building stone, marble, coal, iron ore, hydraulic 



limestone, lime, brick materials, agriculture) V.281 



Montgomery Co., (G. C. BBOADHEAD) VI, 149-155 



Physical features VI, 149 



Sections of strata VI, 128, 151-154; VII,27,37; VIII, 46 



Quaternary deposits VI, 150 



Coal measures VI, 151; VII.27; VIII.46 



Economical Geology, (coal, building rock, agriculture) : VI, 153 



Natural oil... VII.37 



