CONTENTS. xiii 



CHAPTER IX. page 



Terminal Moraines 203-225 



Indefiniteness of the Term, 203 ; Prominence of the Moraine south of New Eng- 

 land, 204 ; Details respecting the Kettle-holes in this Part of the Moraine, 205 ; 

 Submerged Portions of the Moraine, 206 ; Moraines of the Middle States, 207 ; 

 President Chamberlin on the Moraines west of the Alleghanies, 207 ; Gilbert on 

 the Moraines of the Maumee Valley, 207 ; the Kettle Moraine of Wisconsin, 211 ; 

 Battle of the Glaciers in Minnesota and Wisconsin, 212 : Moraines in Dakota, 2 14 ; 

 in Central British America, 217 ; Later Moraines in the White Mountains, 221 ; 

 on the Sierra Nevada and Cascade Mountains, 222 : Moraines of the Wisconsin 

 Episode, 222 ; LUinoisan Deposits, 223 ; Iowan Deposits. 223 ; Kansas Deposits, 

 224 ; the Aftonian Episode, 224. 



CHAPTER X. 

 Glacial Erosion and Transportation . . . 226-280 



Erosive Action of Ice compared with that of Running Water, 226 : Chemical 

 Action of Water, 229 ; Danger of exaggerating the Erosive Action of Ice, 230 ; 

 Glacial Erosion least Dear the Margin, 233 ; Analogy between the Glacial Front 

 and Breakers in the Ocean, 234 ; Transportation of Bowlders en the Surface of a 

 Glacier, 236 ; Details respecting, in Southern New England, 237 ; in Richmond, 

 Mass., 239 ; in New Jersey and Pennsylvania, 241 ; in Ohio, 242; in Southern In- 

 diana and Illinois, 243 ; in Iowa and Dakota, 243 ; in British America, 244 ; Ele- 

 vation of Bowlders in the Ice, 246 ; Explanation of, 24S ; Erosion of Subglaclal 

 Streams, 254 ; Erosion estimated by the Amount of Till, 257 ; Attempts at Direct 

 Measurement of Glacial Erosion near the Delaware Water-Gap, 260 ; affected by 

 Preglacial Disintegration, 261 ; Evidence of, near Western End of Lake Erie, 262 ; 

 in the Sierra Nevada, 267 : Summary, 279. 



CHAPTER XI. 

 Drumlins 2S1-297 



Definition, 281 ; those in the Vicinity of Boston Enumerated, 2S1; Mr. Upham's 

 Description, 2S2 ; Series of, in Rockingham County, N. H., and Essex County, 

 Mass., 234 ; Occurrence of, in the Interior of the Country, 2S5 ; Theory of their 

 Formation, 287; Irregularities of Glacial Erosion and Deposition, 294. 



CHAPTER Xli. 

 Preglacial Drainage 29S-312 



Length of Preglacial Time, 298 ; extent of Preglacial Erosion, 299 ; the Trough of 

 the Ohio preglacial, 300 ; Other Preglacial Valleys, 302 : Preglacial Drainage of the 

 Great Lakes, 304 ; Preglacial Drainage of the Upper Allegheny River into Lake 

 Erie, 307. 



CHAPTER XIII. 



Drainage of the Glacial Period .... 313-337 



Obstruction of Ice-barriers across the Red River of the North, the St. Lawrence, 

 and the Mohawk, 313 ; Closing Floods of the Glacial Period, 314 ; Terraces pro- 

 duced by these Floods In the Trough of the Mississippi; in the Minnesota. 315 ; 



