CONTENTS 



Page 



Acknowledgements ----------- 56 



Rock Formations ------------ 57 



Structure --------_---__ 53 



The Stage of Erosion ---------- 60 



Evidences of More Than One Cycle of Erosion - 60 



Even-crested Summit Areas (the Dodgeville Plain) 60 



The Cuesta-single Cycle Theory ------ 69 



The Peneplain Theory --------- 79 



Intermediate Plain (the Lancaster Plain) - - - 84 



Antecedent Streams ---------- 95 



Mississippi River ----------- 97 



Other Streams ----------- 104 



Intrenched Meanders ---------- 105 



Associated Sets of Crooked and Straight Streams - 108 



Stream Terraces ------------ 109 



Upland Fluvial Deposits (High Level Gravels) - - 111 



Conclusion __---_------- 113 



The Number of Erosion Cycles ------- 115 



The History of Diastrofhism ------- 116 



The Dates of Events ---------- 120 



The Age of the Dodgeville Plain ------ 121 



The Age of the Lancaster Plain ------ 123 



Summary of Events ----------- 125 



