LIST OF ILLUSTRATIONS 



PAGE 



Plate I. Map of Illinois, showing oil fields, cross-section lines, posi- 

 tion of structural terraces and of the La Salle anticline 89 



Plate II. General cross-section, A-A, from St. Louis. Mo., to Vin- 

 cennes, Ind In pocket 



Plate III. General cross-section, C-C, from Xew Athens to Eldo- 

 rado, 111 In pocket 



Plate IV. General cross-section, D-D, from Marion to Salem, 



111 In pocket 



Plate V. General cross-section, E-E, from Beardstown to the 



Indiana State line In pocket 



Plate VI. A coal-contour map, showing geologic structure and 



development in the Marion County oil fields In pocket 



Plate VII. View of exposure of Essex limestone near Elssex. 111.... 100 



Figure 1. Section through post-glacial fluviatile deposits of Wilmette 



Bay, Glacial Lake Chicago 109 



Figure 2. Mean daily evaporation rates in the sand dune plant asso- 

 ciations and in the beech-maple forest 121 



Figure 3. Diagram showing the comparative evaporation rates in 

 diflferent associations on the basis of the average daily amount 

 from May 6 to October 31, 1910 124 



Figure 4. Diagram showing the comparative evaporation rates in 

 diflFerent plant associations on the basis of the maximum average 

 amount per day for any week between May 6 and October 31. 

 1910 125 



Figure 5. Variation curv-es of pond snails and crustaceans 130 



Note. — Plates I- VI were loaned by the Illinois Geological Survey; 



Figures 2-4 were loaned by the University Press, fniversitj- of Chicago. 



