LIST OF PLATES 



FACES PAGE 



L Dunes in contour 96 



II. Streams disappearing in sand, gravel, etc., in an arid region . 120 



III. Youthful valleys, shore of Lake Michigan 121 



IV. Map illustrating piracy. Kaaterskill Creek, N. Y. ... 124 

 V. The widening of the river valley by the meandering of the 



stream 125 



VI. Youthful valleys and topography in a region of slight relief and 



in a region of great relief 128 



VII. Topographic maturity 132 



VIII. Topographic old age 133 



IX. Niagara Falls and its surroundings 156 



X. Cushetunk and Round mountains, N. J 157 



XI. Entrenched meanders. Conodoguinet Creek, Pa 172 



XII. Section of the California coast at Oceanside, showing changes of 



level of the land 173 



XIII. Alluvial fan at the base of mountains, Cucamonga, Cal. . 182 



XIV The alluvial plain of the Missouri and Big Sioux; S. Dak. . 183 



XV. Limestone sinks due to ground-water 208 



XVI. Glaciers of Glacier Peak, Wash 236 



XVII. Glaciers and cirques of the Bighorn mountains .... 237 



XVIII. An ill-drained plain of glacial drift; Southern Wisconsin . . 270 



XIX. Irregularities of coast developed by erosion and deposition . 306 



XX. Shore-line of Marthas Vineyard, Mass . 307 



XXI. The upper end of Seneca Lake, N. Y. 335 



