LIST OF PLATES 



FACES 



PAGE 



I. A narrow coastal plain in Oregon 4 



II. A narrow mountain ridge in Pennsylvania ... 5 



III. Pig. 1. A plain in Wyoming. Pig. 2 Relief-map of the 



Northern Appalachians and their surroundings . . 6 



IV. Fig. 1 A portion of the Elk Mountains of Colorado. Fig. 



2 Massive, or unstratified, rock; the Upper Yosemite 



Falls 7 



V. Fig. 1. A group of dunes at the head of Lake Michigan. 



Fig. 2. Desert dunes near Biskra, Algeria ... 10 

 VI. Fig 1. Sand drifted over a railway. Fig. 2. A resur- 

 rected forest 11 



VII. Fig. 1. Mound-shaped dunes, along a river, near Lamed, 

 Kansas. Fig. 2. Dunes at the south end of Lake Mich- 

 igan. Fig. 3. Dunes on the plains of western Nebraska 12 

 VIII. A stream widening its valley by lateral planation . . 13 

 IX. Fig. 1. The shelling off of a granite bowlder near East 

 Tensleep Lake, Wyoming. Fig. 2. A peculiar form of 

 shelling off, or exfoliation, in granite .... 16 



X. Exfoliation on a mountain slope ..... 17 



XI. Fig. 1. Giant Geyser, Yellowstone National Park. Fig. 



2. Cone (or crater) of Grotto Geyser, Yellowstone Park 32 

 XII. Fig. 1. An artesian well ten miles northeast of Mitchell, 

 South Dakota. Fig. 2, Fig. 3. Views in Marengo 

 Cave, Southern Indiana ...... 33 



XIII. Fig. 1. Grand Canyon of the Colorado. Fig. 2. Joints 



in bed rock 52 



XIV. Sketch of a part of the Grand Canyon of the Colorado . 53 

 XV. Fig. 1. Oneonta Gorge, Oregon. Fig. 2. Natural Bridge 



of Virginia. Fig. 3. Bad lands of South Dakota . 60 

 XVI. Fig. 1. Rapids; outlet of Walker Lake, Alaska. Fig. 2. 



Niagara Falls 61 



XVII. Fig. 1. The well-developed flat of the Mississippi, near 

 Prairie du Chien, Wisconsin. Fig. 2. A meander of the 

 Missouri River. Fig. 3. Later development of a meander 64 



