INDEX. . 



PAGE. 



Adair county 336 



Adams county 339 



Alluvium 102 



Angiospermous leaves in Nishnabotany sandstone 291, 366 



Area and boundaries of State 28 



Azoic System , ' 167 



Brown, Robert D.. hydraulic cement 186 



Burlington limestone ... 201 



fish remains of 207 



crinoids of 209 



Carboniferous System 189 



general remarks upon 250 



Cass county 371 



Caverns 80 



Cincinnati group 180 



Clarke county 316 



Classification of Iowa rocks 25 



Clear lake 73 



Climate 139 



Coal, boring for at Nebraska City , , 360 



Coal-measure group 231 



Coal-measures, Lower 232 



Middle 241, 264 



Middle, general section of 272 



economic geology of 283 



Upper 241 



Coal-mining in Iowa, practical conclusions concerning 258 



Copper in drift 96 



Cretaceous pebbles, fossils in 290 



Decatur county . , 318 



Deposits, ancient marsh 117 



387 



