CONTENTS. ix 



Chapter XI.— The Chicago Outlet and beaches or Lake Chicago— Continued. p a „ e 

 The glacial Lake Chicago — Continued. 



Interval of emergence 440 



Second, or Calumet, beach _ 442 



Possible second emergence. 



446 



Third, or Tolleston, beach 447 



The present beach of Lake Michigan 453 



Chapter XII. — Influence of the drift on drainage systems and drainage conditions.. 460 



The Mississippi Valley. 401 



Accession from the north (?) _ 454 



Minor deflection at Fulton, Illinois 4g2 



Deflection past the Leclaire, or upper, rapids 463 



Reestablished stream between upper and lower rapids 467 



Deflection at the lower rapids 469 



Reestablished stream below the lower rapids 473 



Deflections sonth of glacial boundary 474 



Rock floor and present stream compared _ 474 



Minor tributaries of the Mississipppi 477 



Apple River _ 477 



Plum River 478 



Edwards River 47y 



Henderson River 479 



Flint River _ 479 



Lost Creek 480 



Rear Creek 4g0 



Bay Creek _ _ 480 



Big Meadow channel 484 



Rock River drainage basin 483 



The preglacial drainage 483 



Present course of Rock River 486 



Green River 490 



Rock gorges of northwestern Illinois 493 



Illinois River drainage basin 496 



The lower Illinois 499 



The upper Illinois _ _ 501 



Des Plaines River 503 



Kankakee River _ 505 



Au Sable Creek and Nettle Creek 508 



Mazon Creek, etc _ 508 



Fox River ._ __ 509, 



Covel Creek 510 



Vermilion River ._ 544 



Little Vermilion River, etc 540 



Bureau Creek _ _ 512 



Kiekapoo Creek 543 



Farm Creek 514 



Mackinaw River 514 



Quiver Creek _ 545 



Copperas Creek 516 



Spoon River _ 516 



Sangamon River 547 



Crooked Creek 520 



McKee's Creek 521 



Indian, Mauvaise Terre, and Big Sandy creeks 521 



Apple Creek 522 



Macoupin Creek _ 522 



Otter Creek 593 



