THE OVERTHROW OF A FAMOUS THEORY OF THE ORIGIN OF THE EARTH AND MAN
When Cuvier was supreme among geologists his theory that the great geological ages ended with sudden catastrophes which annihilated all life, and that all life was then created afresh, was universally accepted. One result of this theory was the disbelief in the existence of man before the Glacial Age. Boucher de Perthes sought to establish the former existence of Drift Man on finding human relics in the Somme Valley; but not until Sir Charles Lyell threw his influence on the side of De Perthes was the Preglacial existence of man admitted, and the long-accepted theory of Cuvier overthrown.
In spite of the most eager search for similar relic-beds affording sure evidence of Drift Man, only a very few have as yet been discovered that can be placed by the side of those in the Somme valley. Two are in Germany, and are the more valuable as a more exact date can be given to them within the Drift Period. One is near Taubach (Weimar), the other at the source of the Schussen. The one at Taubach belongs to the Interglacial Period, that at the source of the Schussen to the Postglacial Period. The former lies on the moraines of the first Glacial Period, which was followed by the Interglacial Period; the latter on the moraines of the second Glacial Period, which slowly passed into the Postglacial Period.
The Climate of the Ice Age
The Drift relic-bed in the calc-tufa near Taubach lies, as we have said, over the remains of the first Glacial Period, and according to Penck, one of the best authorities on the Drift, belongs to the warmer intermediate epoch between the two great periods of glaciation. The proofs given by the plant and animal remains agree entirely with the proofs given by the conditions of stratification. In the rich fauna found there, animals indicating a cold climate are entirely absent, and a comparison of the whole of the finds proves that at the time when man was present there no kind of arctic conditions can have prevailed. There is no reindeer, no lemming. The roe, stag, wolf, brown bear, beaver, wild boar, and aurochs were at that time inhabitants of these regions, and the only inference they allow is that of a temperate climate. The mollusc fauna, in which also all Glacial forms are absent, also leads to the same conclusion; all that occur are familiar to us from those of the present day in the same district. The fauna would really appear quite modern were it not that a very ancient stamp is imparted to it by several extinct types. With the modern animals enumerated are associated the cave-lion, cave-hyena, ure-elephant, and Merckian rhinoceros, characterising the whole deposit as a distinctly Drift one, which is still further proved stratigraphically by the covering of “loess.” The Taubach relic-bed is a typical illustration of the climatic and biological conditions of the warmer Interglacial Period; the regions of Central Europe, which had been covered with masses of ice in the first Glacial Period, had, after the ice melted, become once more accessible to the banished plants and animals of the Preglacial Period, until they were annihilated, or at least driven definitely from their old habitats by the second Glacial Period. The celebrated relic-bed at the source of the Schussen, near Schussenried, at a little distance from Ulm, brings us—in strong contrast to Taubach—into quite glacial surroundings. It was on the glacier-moraines of the last great glaciation, and belongs, therefore, to that period which must still be reckoned as part of the Drift—the Postglacial Period, which gradually passed into the warmer present period. Under the tufa and peat at the source of the Schussen we find the type of a purely northern climate, with exclusively northern flora and fauna; everything corresponds to climatic conditions such as prevail nowadays on the borders of eternal snow and ice, or begin at 70° north latitude.
Flora and Fauna of the Ice Age
Schimper, one of the best authorities on mosses at the present day, found among the plant-remains under the tufa at the source of the Schussen only mosses of northern or high Alpine forms. Among them was a moss brought from Lapland by Wahlenberg, which, according to Schimper, occurs in Norway near the chalets on the Dovrefjeld, on the borders of eternal snow, and also in Greenland, Labrador, and Canada, and on the highest summits of the Tyrolese Alps and the Sudetic Mountains. It has a special preference for the pools in which the water of the snow and glaciers flows off with its fine sand. There were also found mosses which have now emigrated to cold regions, to Greenland and the Alps. The most numerous animals were the reindeer, and yellow and Arctic foxes, as distinctly Arctic forms; and there were also the brown bear and wolf, a small ox, the hare, the large-headed wild horse—which always occurs in the Drift as the companion of the reindeer—and, lastly, the whistling swan, which now breeds in Spitzbergen or Lapland. There is an absence of all the present animal forms of Upper Swabia, as well as of the extinct Drift animals, either of which would indicate a warmer climate.
More decided climatic or biological contrasts than those afforded by the relic-beds at Taubach and the source of the Schussen could not be imagined; here we have with certainty two perfectly different periods before us, but both belonging to the general Drift Era.
Although almost all the other places where Drift Man has been found exhibit peculiarities, Taubach and the source of the Schussen seem the best representatives of the two chief types in Europe. Places giving better proof have not yet come to light anywhere in the Old World.
