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Updated: May 8, 2025
Where, as in New England and other glaciated countries, the surface of the earth is covered with a thick layer of sand and gravel, which, except when frozen, readily admits the water; the rainfall is to a very great extent absorbed by the earth, and only yielded slowly to the streams. In these cases floods are rare and of no great destructive power.
In the Permian age we had solid proof in the shape of vast glaciated regions. It is claimed by continental geologists that certain early Tertiary beds in Bavaria actually prove a similar, but smaller, glaciation in Europe, but this is disputed.
Let us now turn to another highland only the northern part of which was glaciated. The Appalachian highland, the second great division of North America, consists of three parallel bands which extend southwestward from Newfoundland and the St. Lawrence River to Georgia and Alabama.
As these were the most northern erratics and glaciated surfaces reported in the southern hemisphere, the facts there were very interesting to him. With dredgings off the Rio de la Plata, and along the coast between that and the Rio Negro, the vessel held on her way to the Gulf of Mathias, a deep, broad bay running some hundred miles inland, and situated a little south of the Rio Negro.
Pretty cottages occur at intervals along the road, covered with honeysuckle, and many an upswelling rock, freshly glaciated and furred with yellow mosses and lichen, telling interesting stories of the icy past.
Bryce in 1865 ascertained that the fresh-water formation containing these fossils rests on carboniferous sandstone, and is covered, first by a bed of marine sand with arctic shells, and then with a great mass of till with glaciated boulders.
After it has, in this contracting process, reached two thirds of its first height, it can usually be relied upon to carry horse and man. The surface of this drift, which covered a ditch besides the grade and its grassy flanks, showed that curious appearance that we also find in the glaciated surfaces of granite rock and which, in them, geologists call exfoliation.
In spite of the fact that glaciation causes swamps and lakes, the proportion of land cultivated in the glaciated areas is larger than in the driftless. In the glaciated area 61 per cent of the land is improved and in the driftless area only 43.5 per cent.
Bumstead in 1912, when he determined the Apurimac and the Urubamba to be thirty miles farther apart than any one had supposed. His surveys opened an unexplored region, 1500 square miles in extent, whose very existence had not been guessed before 1911. It proved to be one of the largest undescribed glaciated areas in South America.
Where the country rock is sandy, the soil is so much improved by a mixture of fertilizing limestone or even of clay and other materials that the average yield of crops per acre in the glaciated areas is a third larger than in the driftless. Taking everything into consideration it appears that the ancient glaciation of Wisconsin increases the present agricultural output by from 20 to 40 per cent.
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