CHAPTER XXII

THE CONTINENTAL GLACIERS OF THE “ICE AGE”

Earlier cycles of glaciation—Contrast of the glaciated and nonglaciated regions—The “driftless area”—Characteristics of the glaciated regions—The glacier gravings—Younger records over older: the glacier palimpsest—The dispersion of the drift—The diamonds of the drift—Tabulated comparison of the glaciated and nonglaciated regions—Unassorted and assorted drift—Features into which the drift is molded—Marginal or “kettle” moraines—Outwash plains—Pitted plains and interlobate moraines—Eskers—Drumlins—The shelf ice of the ice age—Character profiles 297