xviii LIST OF ILLUSTRATIONS. 



FIG. PAGE 



41. Glacial striae, Amherst, Ohio. (Chamberlin.) 124 



42. Cut in till, Hamilton, Ohio 128 



43. Cut in till, Darrtown, Ohio 131 



44. Glacial map of southern New England 138 



45. Glacial map of New Jersey 141 



46. Glacial map of Pennsylvania and southern New York 145 



47. Glaciated pebble, Pennsylvania 146 



48. The same, side view 147 



49. Attenuated border, eastern Pennsylvania. (Williams.) 152 



50. Lake Lesley, Pennsylvania ... 157 



51 . Advance of Wisconsin Ice over the Kansan border near the apex of New York - 157 



52. Lake Allegheny 159 



53. Map of the upper Allegheny Valley, Pa 165 



54. Sand pit at "Warren, Pa 167 



55. Bar at Warren, Pa 167 



56. Glacial map of Ohio 168 



57. Glacial map of southern Indiana 171 



58. Glacial map of southern Illinois 173 



59. Typical section of till in Seattle, Washington State 181 



60. Section of modified drift at Point Wilson, Washington State . . . .182 



61. Glacial groovings, Victoria, British Columbia 184 



62. Glacial map of North America . 191 



63. Depth of ice and erosion in eastern Pennsylvania. (Lesley.) .... 196 



64. Map of kettle-holes near Wood's Holl, Mass. 205 



65. Map of morainal deposits, western New York. (U. S. Geological Survey.) . 206 



66. View of kettle-moraine, Eagle, Wis. (Chamberlin.) 210 



67. Map of the Missouri coteau. (Todd.) 216 



68. Glacial map of central British America. (Dawson.) 218 



69. The Missouri coteau. (Dawson.) 219 



70. Canon of the Colorado. (Newberry.) 226 



71. Embossed floor of an ancient glacier, Colorado. (Hayden.) .... 227 



72. Glacial bowlder, Gilsum, N. H. (Hitchcock.) 236 



73. Mohegan Rock, Montville, Conn 238 



74. Glaciated pebble, Indiana 252 



75. Reverse side cf the same 253 



76. Ideal section showing distribution of till 257 



77. Ideal section showing sub-aerial disintegration. (Chamberlin.) . . . 261 



78. Glacial grooves, South Bass Island, Lake Erie 263 



79. Tortucus glacial grooves, Kelley's Island, Lake Erie. (Chamberlin.) . . 264 



80. Section of glacial furrows, Kelley's Island, Lake Erie 267 



•81. Full view of the same. (Younglove.) 268 



82. Glacial furrows, South Bass Island, Lake Erie 270 



-83. Glacial furrows, Gibraltar Island, Lake Erie 272 



84. Cross striae, Middle Bass Island, Lake Erie 275 



85. Iowan bowlders. (Calvin.) 280 



86. Map of drumlins near Boston. (Davis.) 281 



■87. View of Corey's Hill, Brookline, Mass. A typical drumlin. (Davis.) . . 282 



88. Outline of drumlins in Boston Harbor. (Davis.) 283 



89. Map of drumlins in northeastern Massachusetts. (Davis.) .... 284 

 ■90. Outline of drumlins, central New York. (Davis.) 285 



91. Drumlins in Wisconsin. (Chamberlin.) 286 



92. Drumlins in Goffstown, N. H. (Hitchcock.) 287 



93. Drumlins in Ireland. (Kinnehan and Close.) 291 



94. Section of the valley of the Cuyahoga River. (Claypole.) .... 304 



95. Cross-section showing old and new channels Of the Mississippi River. (Iowa 



Geological Survey.) 310 



