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Updated: May 19, 2025
And while he admits that at one time he was strongly inclined to suspect that they were not coeval , yet he has been compelled by subsequent evidence, especially in view of the fact that he has had convincing proofs in later years that the remains of the mammoth and many other extinct species, very common in caves, occur also in undisturbed alluvium, imbedded in such a manner with works of art as to leave no room for doubt that man and the extinct animals coexisted, to reconsider his former opinion, and to assign to the proofs derived from caves of the high antiquity of man a much more positive and emphatic character.
They have also been traced far up the valley above Amiens, wherever patches of the old alluvium occur. They have all been derived from the Tertiary strata which once covered the Chalk.
But here for every old, storm-stricken giant there are many in all the glory of prime vigor, and for each of these a crowd of eager, hopeful young trees and saplings growing heartily on moraines, rocky ledges, along watercourses, and in the moist alluvium of meadows, seemingly in hot pursuit of eternal life.
Instead of the running water cutting deeper into the earth it has partly filled the canon with alluvium, thereby demonstrating nature's universal leveling process. Even the floods of water which pour through them during every rainy season with an almost irresistible force carry in more soil than they wash out and every freshet only adds new soil to the old deposits.
If the reader will refer to the section of the Pleistocene sands and gravels of Menchecourt, near Abbeville, given at page 96, he will perfectly understand the relations of the ancient Thames alluvium to the modern channel and plain of the river, and their relation, on the other hand, to the boundary formations of older date, whether Tertiary or Cretaceous.
That the actual capacity of a channel through alluvium depends upon its service during floods has been often shown, but this capacity does not include anomalous, but recurrent, floods.
Politically, the Terai generally belongs to the hill-states beyond it; geographically, it should appertain to the plains of India; and geologically, it is a sort of neutral country, being composed neither of the alluvium of the plains, nor of the rocks of the hills, but for the most part of alternating beds of sand, gravel, and boulders brought from the mountains.
So the surface gold in the alluvium deposits was all that was collected by the Spaniards, and what there still may be on the bed-rocks of the rivers or in the lodes in the mountains from which it has been washed, awaits the advent of modern gold-seekers.
In about four miles we overtook the gunboat fleet just as it was emerging into Deer Creek. Along Deer Creek the alluvium was higher, and there was a large cotton-plantation belonging to a Mr. Hill, who was absent, and the negroes were in charge of the place.
An excellent clay is readily procurable in all parts of the alluvium; and this, when merely exposed to the intense heat of an Eastern sun for a sufficient period, or still more when kiln-dried, constitutes a very tolerable substitute for the stone employed by most nations.
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