FIG. 1. Geological section of Twin Creek, near Beecher, Will Co., Illinois 108 2. Section across gully at Whitehall, Wisconsin 242 3. Region about Toronto, Ontario 282 4. Eastern Ontario, showing limit of marine and fresh-water beaches 286 5. South shore-line of the Champlain sea 287 6. Preglacial drainage of the Upper Ohio 293 7. Geologic section of Fish House beds at Camden, New Jersey 302 8. Vicinity of Trenton, New Jersey, showing distribution of the Trenton gravels 305 9. Geologic sections at Trenton, New Jersey 305 10. Northern Pennsylvania, showing glaciated areas 309 11. Section of Port Kennedy bone cave at time of first exploration, 1871 318 12. Section of Port Kennedy bone cave at time of last exploration, 1896 318 13. Metatarsal of _Ovis_ sp. indet., from Kendall Co., Illinois 338 14. Relation of the driftless area to the surrounding glaciated areas 342 15. Diagram showing the supposed terraces of the Maryland coastal plain 345 16. Section across Potomac River near Big Pool, Maryland, showing gravel-covered terraces 347 17. Generalized section across Allegheny Valley at Parkers Landing, W. Va. 349 18. Tooth of _Hydrochoerus pinckneyi_ 365 19. Jaw and tooth of a wolf from Charleston, South Carolina 366 20. Coastal plain of Georgia 369 21. Geologic section from north to south through the phosphate deposits of Florida 377 22. Geological map of Mississippi embayment 388 23. County map of Tennessee, to show where Pleistocene fossils have been found 395 24. Vertical section of Bigbone Cave, Elroy, Van Buren Co., Tennessee 398 25. Section on bank of Tennessee River at Nashville 400 PREFACE.