4 CONTENTS. 



Chapter III. Pre-Wisconsin drift and associated deposits — Continued. Page. 



Topography 65 



Structure of the pre- Wisconsin drift 66 



Composition 66 



Interbedded deposits 67 



Buried silt or loess •. 67 



Buried soil 68 



Gravel and sand deposits 69 



Drainage 71 



Pre-Wisconsin deposits beneath Wisconsin drift .' 72 



Strife outside of the Wisconsin drift s 72 



Sangamon soil and weathered zone - 73 



Post-Sangamon or main loess and associated silts. . _ 74 



Extent and deposition 74 



Character of the loess 74 



Peorian or postloessial soil and 'weathered zone 75 



Sand deposits on the loess 75 



Chapter IV. The Wisconsin drift border, by Frank Leverett 77 



Correlation of the border moraines 77 



Course and distribution 77 



Topography 77 



Contrast with adjacent country .' 77 



Moraine of the East White lobe 77 



Morainal tract west of East White River 78 



Altitude 78 



Character 79 



Structure of the drift 79 



Contrast with outlying drift 79 



Weathering 79 



Buried soil 79 



Bowlders 80 



Thickness 81 



Outwash 82 



Inner border 82 



General features 82 



St. Omar-Hope undulating strip 83 



Burney esker 83 



Malta undulating strip 83 



Malta esker. _ : _• ' 83 



St. Paul-Hartsville bowlder belt 84 



Strife near border 84 



Glacial drainage 85 



Chapter V. Correlatives of the Champaign morainic system, by Frank Leverett 87 



Interpretation 87 



Course and distribution 87 



Topography 88 



Structure of the drift S9 



Composition 89 



Thickness 90 



Outer border 92 



Inner border 92 



Till plain 92 



Franklin esker 93 



Chapter VI. Correlatives of the Bloomington morainic system, by Frank Leverett 94 



Interpretation 94 



Course and distribution 94 



Topography 94 



Altitude 94 



Character and relief 95 



Structure of the drift 98 



Composition 98 



Contact of Wisconsin and pre-Wisconsin drift 98 



Thickness of the drift 100 



Bowlders 106 



