ILLUSTRATIONS 



Page. 



Platk I. Browns Valley, the outlet of Lake Agassiz by the Rivoi- Warren (Frontispiece.) 



II. Map showing the relationship of Lake Agassiz to the <lrift-bearing area of North 



America and to Lakes Honneville and Lahontan 1 



III. Map showing the areas of Lake Agassiz and of the upper Laurentiau lakes 10 



IV. Town of Browns Valley, Minn I'' 



V. Lake Traverse ^° 



VI. Upper Herman beach of Lake Agassiz 26 



VII. The Lightning's Nest (dunes of the Sheyenne delta) 28 



VIII. The Leaf Hills 34 



IX. Map with altitudes of Lake Agassiz and adjoining country 36 



X. Map with altitudes of the southern portion of Lake Agassiz, explored with leveling 



in Minnesota, North Dakota, and Manitoba 4,0 



XI. Map of Rainy Lake and the Lake of the Woods 48 



XII. Map of Red Lake and its vicinity 50 



XIII. Map of drainage systems ou the area of Lake Agassiz and adjoining country 52 



XIV. Map of the rock formations underlying the drift on the area of Lake Agassiz 65 



XV. Sections of wells at Humboldt, Minn., Grafton, N. D.ak., and Rosenfeld and Morden, 



Manitoba "* 



XVI. Map of the glaciated area of North America HO 



XVII. Map of the drift deposits on the southern portion of the basin of Lake Agassiz 132 



XVIII. Map of Devils and Stump lakes 170 



XIX. Map showing the extent of Lake Agassiz at the times of formation of the Fergus 



Falls and Leaf Hills moraines -1-' 



XX. Map showing the extent of Lake Agassiz at the times of formation of the Itasca and 



Mesabi moraines 



214 



XXI. Map of the Glacial Lake Souris 268 



XXII. Map of the southern portion of Lake Agassiz, explored with leveling in Minnesota, 



North Dakota, and Manitoba, showing the location of Plates XXIII-XXXII 276 



XXIII. Map of Lakes Traverse and Big Stone, and the shores of Lake Agassiz near its 



mouth ^80 



XXIV. Map of the eastern shores of Lake Agassiz from Campbell north to Baruesville and its 



vicinity - 



XXV. Map of the eastern beaches and deltas of Lake Agassiz from Muskoda north to the 



Sand Hill River 290 



XXVI. Map of the eastern shores of Lake Agassiz, in the vicinity of Maple Lake and north- 

 ward -^** 



XXVII. Map showing the greater part of the Sheyenne delta of Lake Agassiz and contiguous 



beaches 3^*^ 



XIII 



