ILLUSTRATIONS. 



PLATES. 



Map Illustrating Limits of the Glacial Drift of North America. 



Profile of the Fresh-Water Drift Deposits froto Lake Eriata the Lake of the Woods. 



WOOD-CUTS. 



Figure 1. Drift Cavities or " Potash Kettles," near Greenbush, Wisconsin 



Figure 2. Drift Cavities 15 to 60 feet deep, head-waters of Oconto river, Wisconsin 



Figure 3. Outline views of Moraine Hillocks and Cavities. Randolph, Portage County, 



Ohio ......... 



Figure 4. Fac-Simile of a Slab of Niagara Limerock, polished and striated by the drift 



forces ; from beneath the red clay. Light House, Sheboygan, Wisconsin 

 Figure 5. Profile along Bank Street, Cleveland, Ohio, representing the slides of October 



1849 ......... 



Figure 6. Beds of Mixed Drift, Chestnut Street, Milwaukee, Wisconsin . 



Figure 1. Drift Bluffs, Shore of Lake Michigan 5 miles South of Milwaukee 



Figure 8. Profile of Ancient Lake Beaches. Eagle Harbor, Lake Superior 



Figure 9. Map showing the rate of the encroachments of Lake Erie at Cleveland, Ohio 



Figure 10 Profile along Bank Street, Cleveland, Ohio, representing the slides of October, 



1849. (Repeated from Fig 5.) .... . 



Figure 11. Fac-Simile of a Slab of Niagara Limerock, polished and striated by the drift 



forces; from beneath the red clay. Light House, Sheboygan, Wisconsin 



(Repeated from Fig. 4.j ...••• ■ 



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