CONTENTS. 13 



Chapter XIV. Glacial Lake Chicago — Continued. 



Glenwood heach — Continued. p age . 



East side of basin 352 



West side of basin 354 



Calumet beach 354 



General features 354 



Distribution in Michigan 354 



Structure 355 



Topography , 355 



Peaty deposits 356 



Toleston beach 356 



Distribution ' 356 



Correlation 357 



Beaches lower than the Toleston 357 



Sand dunes 357 



Chapter XV. Glacial Lake Saginaw, by F. B. Taylor 358 



History of the lake 358 



Outline of history 358 



Early Lake Saginaw 358 



Lakes Saginaw and Arkona 358 



Second Lake Saginaw 359 



Lakes Saginaw and Wayne 359 



Lakes Saginaw and Warren 359 



■ Lakes Saginaw and Lundy (Lake Dana, Lake Elkton) 359 



Ice barriers of Lake Saginaw 360 



Grand River channel 360 



History 360 



Deepening .- 360 



Relation to Arkona beaches of Lake Saginaw 361 



Chapter XVI. Glacial Lake Arkona, by F. B. Taylor 362 



Early investigations 362 



Arkona beaches in Michigan 362 



Areal distribution 362 



Unmodified beaches in Saginaw basin 353 



Overridden beaches on the "thumb " 364 



Submerged beaches in Black River Valley '. _ 365 



Black River Bay '. 365 



The three beaches 365 



First Arkona beach • 355 



Second Arkona beach 367 



Third Arkona beach 368 



Beach A, Arkona (?) 369 



Relation of the Arkona beaches of the Black River Bay district to the Port Huron morainic system 



and to Lake Whittlesey 369 



Submerged and modified Arkona beaches between Spring Hill and the Ohio line 370 



Modification of the beaches 370 



Texture 371 



Distribution 372 



Submerged deltas 372 



Arkona beaches in Ohio, Pennsylvania, and New York 373 



Arkona beaches in Ontario 374 



Altitude of the beaches 375 



Glacial barriers 375 



Correlatives of Lake Arkona 376 



Chapter XVII. Glacial Lake Whittlesey, by F. B. Taylor 377 



General features 377 



Whittlesey beach in Michigan 377 



General distribution 377 



Between the Ohio line and Spring Hill 377 



Whittlesey beach in Black River Bay 378 



Whittlesey beach in Ohio, Pennsylvania, and New York 3S0 



Whittlesey beach-in Ontario 381 



Altitude of the beaches 381 



