315. Map of the north polar regions, showing the area of drift ice and the tracks of the _Jeannette_ and the _Fram_ 288 316. The shelf ice of Coats Land with surrounding pack ice 290 317. Tidewater cliff on a glacier tongue from which icebergs are born 290 318. A Greenlandic iceberg after a long journey in warm latitudes 291 319. Diagram showing one way in which northern icebergs are born from the glacier tongue 291 320. A northern iceberg surrounded by sea ice 292 321. Tabular Antarctic iceberg separating from the shelf ice 293 322. Map of the globe, showing the areas covered by continental glaciers during the “ice age” 297 323. Glaciated granite bowlder weathered out of a moraine of Permo-Carboniferous age, South Australia 298 324. Map to show the glaciated and nonglaciated regions of North America 298 325. Map of the glaciated and nonglaciated areas of northern Europe 299 326. An unstable erosion remnant characteristic of the “driftless area” 300 327. Diagram showing the manner in which a continental glacier obliterates existing valleys 301 328. Lake and marsh district in northern Wisconsin 302 329. Cross section in natural proportion of the latest North American continental glacier 303 330. Diagram showing the earlier and the later glacier records together upon the same limestone surface 304 331. Map to show the outcroppings of peculiar rock types in the region of the Great Lakes, and some localities where “drift copper” has been collected 305 332. Map of the “bowlder train” from Iron Hill, Rhode Island 306 333. Shapes and approximate natural sizes of some of the diamonds from the Great Lakes region 307 334. Glacial map of a portion of the Great Lakes region 308 335. Section in coarse till 310 336. Sketch map of portions of Michigan, Ohio, and Indiana, showing the distribution of moraines 312 337. Map of the vicinity of Devil’s Lake, Wisconsin, partly covered by the continental glacier 313 338. Moraine with outwash apron in front 313 339. Fosse between an outwash plain and a moraine 314 340. View along an esker in southern Maine 315