Men of the Old Stone Age: Their Environment, Life and Art

by Henry Fairfield Osborn

One reason why certain authors, such as Boule and Depéret, have placed this stage in the Upper Pliocene is that the mammals include so many surviving Pliocene forms, such as the sabre-tooth tigers (Machærodus), the 'polycladine' deer with the elaborate antlers (C. sedgwicki), the Etruscan rhinoceros, and the primitive Steno's horse. But we have recently discovered that, with the exception of the 'polycladine' deer, these mammals certainly survived in Europe as late as the Second Interglacial Stage, and there is said to be evidence that some even persisted into the Third Interglacial Stage.

It is, therefore, the extinction or disappearance from Europe of many of the animals very abundant even in late Pliocene times which marks this fauna as early Pleistocene. Anthropoid apes are no longer found; indeed, there is no evidence of the survival of any of the primates, except macaques, which survive in the Pyrenees to late Pleistocene times; the tapir has entirely disappeared from the forests of Europe; but the most significant departure is that of the mastodon, which is believed to have lingered in north Africa and which certainly survived in America into very late Pleistocene times. The animal life of western Europe, like the plant life, has lost one part of its Pliocene aspect while retaining another part, both in its mammalian fauna and in its forest flora.

Fig. 28. The sabre-tooth tiger (Machærodus), which survives from the Upper Pliocene and is widely distributed over western Europe until the Middle Pleistocene. After a painting by Charles R. Knight, in the American Museum of Natural History.

The living environment as a whole, moreover, takes on a novel aspect through the arrival, chiefly from the north, of the more hardy animals and plants which had been evolving for a very long period of time in the temperate forests and meadows of Eurasia to the northeast and northwest. From this Eurasiatic region came the stag, or red deer (Cervus elaphus), also the giant deer (Megaceros), and from the northerly swamps the broad-headed moose (Alces latifrons). The presence of members of the deer family (Cervidæ) in great numbers and representing many different lines of descent is one of the most distinctive features of First Interglacial times. Beside the new northerly forms mentioned above, there was the roe-deer (Capreolus), which still survives in Europe, but there is no longer any record of the beautiful axis deer (Axis), which has now retreated to southern Asia. The 'polycladine' deer, first observed in the valley of the Arno, is represented in First Interglacial times by Sedgwick's deer (C. sedgwicki), in Norfolk, and by the species C. dicranius of northern Italy, where there also occurs the 'deer of the Carnutes' (C. carnutorum).

We observe that browsing, forest-living, and river-living types predominate. Among the forest-frequenting carnivores were the wolverene, the otter, two kinds of bear, the wolf, the fox, and the marten; another forest dweller was a wild boar, related to the existing Sus scrofa of Europe.

Thus in the very beginning of Pleistocene times the forests of Europe were full of a wild life very similar to that of prehistoric times, mingled with which was the Oriental element, the great elephants, rhinoceroses, and hippopotami connecting Europe with the far east. Among these eastern migrants in the early Pleistocene were two new arrivals, the primitive wild cattle (Bos primigenius), and the first of the bison (Bison priscus).

The theoretical map of western Europe during First Interglacial times (Fig. 12, also Fig. 56) enables us to understand these migrations from the northeast and from the Orient. As indicated by the sunken river channels discovered on the old continental shelf, the coast-line extended far to the west to the borders of the continental plateau which is now sunk deep beneath the ocean; the British Isles were separated from France not by the sea but by a broad valley, while the Rhine, with the Thames as a western tributary flowed northward over an extensive flood-plain, which is the present floor of the North Sea basin.[(12)] It is not improbable that the rich mammalian life deposits in the 'Forest Bed of Cromer,' Norfolk, were washed down by tributaries of this ancient Rhine River.

In all the great rivers of this enlarged western Europe occurred the hippopotami, and along the river borders and in the forests browsed the Etruscan rhinoceros. Among the grazing and meadow-living forms of the Norfolk country of Britain were species of wild cattle (Bos, Leptobos), together with two species of horses, including a lighter form resembling Steno's horse (E. stenonis cocchi) of the Val d'Arno and a heavier type probably belonging to the forests. The giant elephant of this period is the southern mammoth (E. meridionalis trogontherii), a somewhat specialized descendant of the Pliocene southern mammoth of the valley of the Arno; this animal is best known from a superb specimen discovered at Durfort (Fig. 42) and preserved in the Paris Museum. It is said to have attained a height of over 12 feet as compared with 11 feet 3 inches, the height of the largest existing African elephants. It is probable that all these south Asiatic migrants into Europe were partially or wholly covered with hair, in adaptation to the warm, temperate climate of the summers and the cool winters. To the south, in the still milder climate of Italy, the arrival of another great species, known as the 'ancient' or 'straight-tusked elephant' (E. antiquus), is recorded. This animal had not yet reached France or Britain.

Preying upon the defenseless members of this heterogeneous fauna were the great machærodonts, or sabre-tooth tigers, which ranged over Europe and northern Africa and into Asia. It does not appear that the true lions (Felis leo) had as yet entered Europe.