=Tabulated comparison of the glaciated and nonglaciated regions.=—It will now be profitable to sum up in parallel columns the contrasted peculiarities of the glaciated and the unglaciated regions. UNGLACIATED REGION GLACIATED REGION TOPOGRAPHY The topography is _destructional_; The topography is _constructional_; the remnants of a plain are found the remnants of a plain are found at the highest levels or upon the at the lowest levels in lakes and hill tops; hills are _carved_ out swamps; hills are _molded_ above a of a high plain; unstable erosion plain in characteristic forms; no remnants are characteristic. unstable erosion remnants, but only rounded shoulders of rock. DRAINAGE The area is completely drained, The area includes undrained and the drainage network is areas,—lakes and swamps,—and _arborescent_. the drainage system is _haphazard_. ROCK MANTLE The exposed rock is decomposed No decomposed or disintegrated and disintegrated to a rock is “in place”, but only considerable depth; it is all of hard, fresh surface; loose rock local derivation and hence of few material is all foreign and of many types—_homogeneous_; the fragments sizes and types—_heterogeneous_; are angular; soils are leached and rock bowlders and pebbles are hence do not contain carbonates. faceted and polished as well as striated, usually in several directions upon each facet; soils are rock flour—the grist of the glacial mill. ROCK SURFACE Rock surface is rough and Rock surface is planed or grooved, irregular. and polished. Shows glacial striæ. =Unassorted and assorted drift.=—The drift is of two distinct types; namely, that deposited directly by the glacier, which is without stratification, or unassorted; and that deposited by water flowing either beneath or from the ice, and this like most fluid deposited material is assorted or stratified. The unassorted material is described as _till_, or sometimes as “bowlder clay”; the assorted is sand or gravel, sometimes with small included bowlders, and is described as _kame gravel_. To recall the parts which both the glacier and the streams have played in its deposition, all water-deposited materials in connection with glaciers are called _fluvio-glacial_. [Illustration: FIG. 335.—Section in coarse till. Note the range in size of the materials, the lack of stratification, and the “soled” form of the bowlders.]