CONTENTS. 15 



Chapter XXI. Glacial Lake Algonquin— Continued. 

 Port Huron-Chicago stage — Continued. 



Beaches of the Port Huron-Chicago stage— Continued. Page. 



Fort Brady group of Algonquin beaches 436 



Distribution 436 



Altitude 437 



Ottawa or closing transitional stage 438 



Glacial barriers of Lake Algonquin 438 



Correlatives of Lake Algonquin 440 



Complexity of relations 440 



Lake St. Clair 440 



Lake Rouge 44 ^ 



Lake Erie 442 



Separation from glacial lakes 442 



Sequence of stages during Lake Algonquin 442 



Effects of Algonquin uplift 442 



Port Erie beach 443 



Transition to Lake Iroquois 444 



Glacial Lake Iroquois 444 



Glacial Lake Frontenac 445 



Gilbert Gulf 445 



Chapter XXII . The Nipissing Great Lakes, by F. B . Taylor 447 



Location and area 447 



Early literature 447 



Outlet 44S 



Nipissing beach 449 



Name 449 



Discrimination from Algonquin beaches 449 



Distribution in Michigan 450 



Nipissing beach in other parts of the upper Great Lakes basins 456 



Altitude 457 



Post-Nipissing uplifts of northern lands 4g l 



Correlatives of the Nipissing Great Lakes 4 <52 



Lake St. Clair 462 



Lake Erie 462 



Champlain Sea 463 



Chapter XXIII. Post-Nipissing Great Lakes and summary of glacial and nonglacial lakes, by F. B. Taylor 464 



Post-Nipissing Great Lakes 4 ^ 4 



Post-Nipissing beaches 4 ^ 4 



Lake Erie 465 



Recent uplift and present stability of the land 4 65 



General evidences of progressing or very recent uplift 4 65 



Gage readings and progressing uplift 4 67 



Summary of glacial and nonglacial lakes in the Huron-Erie and Michigan basins 469 



Chapter XXIV. Postglacial development of connecting rivers of the Great Lakes, by F. B. Taylor 470 



Relations of rivers 4/0 



Early investigations 4 ™ 



St. Clair-Detroit Valley 472 



St. Clair River 473 



Early distributaries 473 



Erosion of the main moraine of the Port Huron morainic system 473 



Channels 474 



Creases 4/0 



Gravelly bars south of St. Clair 476 



Old river bed south of St. Clair 476 



St. Clair esker. 



477 



St. Clair delta 478 



Source and character of material 478 



Character of the delta 479 



Channels of the new delta 48 " 



Front of the new delta 



Channels of the old delta 481 



Front of the old delta 482 



Recent and progressing changes in the channels 4 °- 



