Viii CONTENTS. 



C'liAPTEH v.— History of Lake Agassiz — Coutiuued. Page- 



Evidences of glacial lakes— Continued. 



Beaches 1™ 



Deltas 200 



Lacustrine sediments 201 



Principal glacial lakes of the northern United States and of Canada 202 



New England, Quebec, the eastern provinces, the Northeast Territory, and Labrador. . 202 



Basins of the Laureutian lakes and of Hudson Bay 203 



Basins of the Saskatchewan and the Red River of the North 205 



British Columbia, Athabasca, and the Northwest Territory 20G 



Extension of Lake Agassiz with the departure of the ice-sheet 208 



Stages of growth shown by moraines 210 



Reduction to the present great lakes of Manitoba 216 



Successive shore-lines of Lake Agassiz 221 



Dependence of the lake levels on the erosion and changes of outlets 222 



Progress of erosion by the River Warren 222 



Later outlets northeastward 226 



Dependence of lake levels on epeirogenic elevation 227 



Depression of the continent shown by coastal submergence 229 



Depression and reelevation of the basin of Lake Agassiz shown by difterentially 



uplifted beaches 230 



Improbable hypothesis of an outlet from Lake Agassiz to the Mackenzie River 231 



Probable hypothesis of the discharge from the northeastward outlets being tributary 



successively to the Mississippi and Hudson rivers 232 



Division of the ice-sheet into parts east and west of Hudson Bay 233 



Amount of differential elevation between Lake Traverse and Gladstone 234 



Alternate stages of elevation and rest 23t) 



Later and greater inclination of beaches along the base of Riding and Duck moun- 



tains . 



235 



Review of the epeirogenic uplifting 236 



Molluscan fauna of Lake Agassiz 237 



Measurements of time since the Glacial perioil 238 



Short duration of Lake Agassiz 240 



Comparison with postglacial lakes 240 



Comparison with Lakes Bonneville and Lahontan 241 



Brevity of time required for the formation of terminal moraines 242 



Alternative interpretations, by T. C. Ciiamberlin 244 



Volume of water received and discharged by Lake Agassiz 252 



Fluvial deposits in the Red River Valley 253 



Associated glacial lakes -51 



The Laurentian lakes 255 



Lake Minnesota 264 



Lake Dakota 266 



Lake Souris 267 



Lake Saskatchewan 2i- 



(ilacial lakes of the Peace and Athabasca basins 274 



