DESCRIPTION OF PLATES 451 



Plate XXXVIII. Wilmette Bay during the Toleston stage. Hammond stage the same. 

 Numerals as in plate XXXIV. 



Plate XXXIX. Ecological map of Braddock's Bay, Lake Ontario, near Rochester, N. Y. 

 30, 36, 60, depths of water in inches. 

 D buildings 

 -.-.- swamps; water 6-18 inches deep; plants consisting 



of Typha, Pontederia, Sagittaria, Sparganium, Decodon, etc. 

 !!! Scirpus 



. . . Castalia and Nymphaea 

 *** trees 



Plate XL. Hook at end of sandy peninsula, east end ot Braddock s Bay. Photograph 

 by Baker. 



Plate XLI. Hook at west end of Braddock's Bay. Photograph by Baker. 



Plate XLII. Portion of Braddock's Bay, marsh-bordered, in which the water is from 

 5 to 9 feet deep. Photograph by Baker. 



Plate XLIII. Typha marsh, Braddock's Bay. Photograph by Baker. 



Plate XLIV. The Englewood stage of Lake Chicago (after Alden). 



Plate XLV. Wilmette Bay during the Englewood Stage. 



Plate XLVI. Map showing greatest extent of the Wisconsin ice sheet, also previous 

 ice sheets. Compiled from Leverett, Taylor, and Chamberlin. 



Plate XL VII. Figure 1. Map showing one of the first courses of drainage from Lake 

 Michigan basin (Leverett and Taylor, Ann Arbor Folio, fig. 6). Figure 2. Map showing 

 formation of Lake Chicago with its southerly outlet. The shaded area represents the glacial 

 lake (Leverett and Taylor, Ann Arbor Folio, Fig. 7). 



Plate XLVni. Glacial Lakes Maumee and Chicago, showing southwestern outlets 

 as well as drainage from the Green Bav basin (Leverett and Taylor, Smith. Report, 1912, 

 fig. 2). 



Plate XLLX. Glacial Lakes Chicago, Saginaw, and \\Tiittlesey, showing drainage from 

 Chicago, Green Bay, and Superior basins (Leverett and Taylor, Smith. Rep., 1912, fig. 3). 



Plate L. Glacial Lakes Chicago and Warren, showing outlet thru Grand River to Lake 

 Chicago (Leverett and Taylor, Smith. Rep., 1912, fig. 4). 



Plate LI. Glacial Lakes Duluth, Chicago, and Lundy, showing outlets thru St. Croix, 

 Chicago, and Syracuse channels (Leverett and Taylor, Smith. Rep., 1912, fig. S). 



Plate LII. Lake Algonquin, with Lakes Erie, Iroquois, and the Champlain Sea. Out- 

 lets at Chicago, Kirkfield (Mohawk-Hudson), and North Bay (Leverett and Taylor, Smith. 

 Rep., 1912, fig. 6). 



Plate LIII. Nipissing Great Lakes with Lakes Erie and Ontario, outlets at North Bay 

 and Port Huron (Leverett and Taylor, Smith. Rep., 1912, fig. 8). 



Plate LIV. Preglacial rivers of the lake basins (Spencer, Falls of Niagara, plate XL). 



Plate LV. Preglacial drainage in the lake basins (during Tertiary time) as worked out 

 by Professor Grabau. The direction of flow is southwestward (Geol. and Paleon. Niagara 

 Falls, fig. 6, p. 45). 



Plate LVI. Map of North America showing maximum development of the ice sheet 

 and indicating (1, 2, 3, 4, 5) probable areas in which the life of the englaciated territory was 

 preserved during the intervals of the Ice Age, when the areas shaded were covered with ice 

 (Willis, Journ. Geol., XVII, p. 60). 



Plate LVII. Figure 1. Portion of Vilas and Oneida counties, Wisconsin, showing topo- 

 graphic conditions in a typical glaciated country (from map published by Chicago and 

 Northwestern Railroad Company). Figure 2. Portion of Driftless Area in Wisconsin, 

 showing regular erosion in a typical unglaciated country (from map published by the Geologi- 

 cal Survey of Wisconsin). 



