390 INDEX. 



PAGE. 



River, Floyd 52 



Grand 144 



Iowa 62 



Little Sioux 51 



Maquoketa 65 



Middle 60 



Mississippi 67 



Missouri 55 



Nishnabotany 47 



Nodaway 47 



North , CO 



One-Hundred-and-Two 46 



Raccoon 60 



Rock 53 



Skunk 61 



Soldier 50 



South 60 



Turkey 65 



Upper Iowa 66 



valleys, relative ages of , 69 



Wapsipinicon 64 



Rivers and their valleys 38 



of the eastern system of drainage of the State 57 



of the western system of drainage of the State 44 



table of slopes of 40 



Sinkholes 78 



Sioux Quartzite 167 



Slopes of general surface of the State, table of 33 



rivers, table of 40 



Smithia Woodmani, description of 188 



Soil of Alluvial Deposits 128 



Bluff Deposit 127 



Drift Deposit 123 



Soils 122 



Southwestern Iowa, Geology of 297 



Spirit Lake 72 



Springs 78 



St. Louis Limestone 215 



Storm Lake 73 



St. Peter's sandstone 174 



Sub-carboniferous group 189 



general remarks upon 222 



Surface Deposits 82 



Swallow, Prof. G. C, on Bluff Deposit 105 



