But, if we are to study the Palaeolithic Age intelligently, we must endeavour to test for ourselves the dogma that Britain was then continental. That dogma has recently been questioned by geologists who have minutely re-examined in the field the phenomena of the Glacial Epoch. Mr. Clement Reid, for instance, holds that in the Palaeolithic Age England never rose more than seventy feet above its present level,[36] and that men first entered it across a narrow strait which was formed in the earlier period of glaciation.[37] It is certain that the sea then washed the coast of Sussex and the western counties; for near Selsea there is a patch of boulder-clay—the only one south of the Thames—which must have been deposited by shore-ice, and there are rocks belonging to Bognor or the Isle of Wight, to the Channel Islands, and to Brittany, which were transported by icebergs and dropped when they melted under the summer sun.[38] Again, before the first English boulder-clay was formed Arctic plants flourished near Cromer; and, says Mr. Reid,[39] ‘as these occur just above the present sea-level, and lie evenly on the strata below without deeply channelling them, the height of the land at the commencement of the Glacial Epoch, in Norfolk at any rate, must have been almost the same as it is now’. The same observer assures us that in Southern Britain the first intense cold was succeeded, after an interval of which geology has nothing to tell, by an interglacial period in which the land sunk about one hundred and forty feet below its present level, so that shingle was deposited on what is now Portsdown Hill;[40] and that it then gradually rose until, long before the second glaciation began, its level, marked by fresh-water and estuarine deposits, once more virtually coincided with the present line.[41] But, he tells us, at some time after the disappearance of the ice which deposited the latest boulder-clay of Norfolk the land stood rather higher than now;[42] and he holds that even in the early part of the Neolithic Age Britain must have been almost connected with the Continent, for many of the river valleys were excavated to depths of from sixty to seventy feet below the present level of the sea.[43] The submerged forests of Devonshire, Cornwall, and the Bristol Channel, which contain traces of neolithic handiwork, flourished at a time when the land stood from fifty to seventy feet above its present elevation.[44]
But there are other facts which demonstrate that at some time after the first period of intense cold—perhaps in that interval of which geology has nothing to tell—the Continent must have included Britain. As we shall presently see, not only the mammoth, the woolly rhinoceros, the glutton, and other Arctic animals, but also many species which prefer a temperate climate, and others which are now tropical, lived in this country side by side with palaeolithic man. Nearly all of them had been represented here before the earliest glaciers of Scotland were formed.[45] But even on the southern side of the Thames the cold was so intense during the earlier part of the Ice Age that none of the tropical, none even of the temperate species could there have lived: since the land was barren, treeless, and frozen,[46] even the mammoth, protected though it was by its woolly coat, could have found little food;[47] and large herds of Arctic animals travelled as far southward as Italy and Spain.[48] It is therefore evident that the beasts of tropical and of temperate climes whose remains have been found in the river-drift and in caves along with palaeolithic implements must have entered Britain after the coldest period had ceased.[49] Moreover, vast quantities of bones of Pleistocene mammals, some of which, such as the reindeer, have never been found in Britain in preglacial deposits, have been dredged up out of the bed of the North Sea, principally from the Dogger Bank;[50] and it is therefore clear that at some time after the climax of the Glacial Period that sea or a large part of it did not exist. It cannot indeed be proved that the men of the river-drift and the caves entered Britain as soon as the other animals;[51] and possibly the Dover Strait may have existed as a narrow channel at the time of their arrival: but since the bones that were raised from the Dogger Bank appear to belong to the time when the Thames was laying down the gravels in which men’s tools have been found,[52] it seems probable that the land bridge was standing in some part of the Palaeolithic Age.
The relation of palaeolithic man to the Ice Age.
It has been demonstrated that palaeolithic men were living in East Anglia after glaciers had finally disappeared from that part of the country. The valleys of the Ouse and its tributaries, in the gravels of which their implements are to be found, were worn down through boulder-clay.[53] Excavations at Hoxne in Suffolk have shown that the people who left their tools there lived at a time which was separated by two climatic waves, attested by the flora of two sets of strata, from the age in which the latest boulder-clay of that district had been deposited.[54] Moreover, in many cases in which evidence has been adduced to show that palaeolithic remains are of glacial or interglacial date, doubts have arisen either as to the artificial character of the flints or as to the age of the beds in which they were found.[55] When, for instance, a member of the Geological Survey announced that he had found palaeolithic implements at Brandon in Suffolk in three interglacial beds, separated by layers of boulder-clay,[56] Sir John Evans suggested that the clay was not in its original position, but had slipped down from a higher level.[57] Again, Dr. Henry Hicks and Sir Joseph Prestwich were convinced that the cave of Cae Gwyn in the Vale of Clwyd had been inhabited before the climax of the Ice Age.[58] Here a flint flake was taken out of earth separated by a superincumbent bed of clay from a layer of sand and gravel, above which again rested boulder-clay that, in Hicks’s judgement, showed no sign of having ever been disturbed, and which, in the opinion of Mr. Clement Reid,[59] must have been deposited before the last glaciation of the district. Even this evidence, however, is not unanimously accepted. Flints have also been found in the Cromer Forest Bed at East Runton, which was certainly preglacial; but Sir John Evans cannot see on them the faintest marks of human workmanship.[60]
Nevertheless, it is not improbable that when the hunters whose tools have been exhumed from the drift of South-Eastern Britain were living in a comparatively mild climate, Scotland, the Lake Country, and the highlands of Yorkshire and Wales may still have been partially buried beneath ice.[61] The high-level drift of the Thames valley, which has yielded so many implements, is believed by eminent geologists to have been laid down at a time when ice spread over Northern Britain;[62] and in support of this view it has been contended that in those regions no palaeolithic implements have been found.[63] The argument cannot be easily set aside; but it has been pointed out that in the northern districts, owing to the extreme scarcity of flint, stone tools could only have been made of harder rocks, on which it is not so easy to detect marks of human agency; that the alluvial deposits in those parts are not readily accessible to search; and that, if they are patiently explored, implements may yet be recovered from them.[64] Some years, however, have elapsed since this suggestion was made; and it has not yet been verified. Moreover, the absence from the country north of Yorkshire, save in a few preglacial deposits, of such bones as have been found with palaeolithic remains seems to indicate that the animals contemporary with palaeolithic man were unable to find food in Northern Britain owing to the continuance of an Arctic climate.[65] Man was undoubtedly living in Southern Britain in the cold period that succeeded the so-called interglacial period of Sussex and Hampshire; for the plateau gravels that cap the Bournemouth cliffs, in which his tools have been found, are older than the valley gravels of the Hampshire Avon and the Stour, which were formed towards the end of the Ice Age by torrents that streamed over frozen chalk downs impervious to water and swept away the fragments of their crumbling surface.[66] Furthermore, stone implements have been found at Caddington below, and near London embedded in, a stratum known as ‘contorted drift’, which is believed to have been formed in a period of great cold;[67] and it is merely a question of words whether this period is to be included in the last phase of the Ice Age.[68]
‘Eolithic’ man?
But there is one district from which evidence has been obtained that has convinced many who sought conviction, that there were men in Britain before the first British palaeolithic tool was made. In the village of Ightham, near Sevenoaks, lives a tradesman, named Benjamin Harrison, whose discoveries have caused much searching of heart, if they have not revolutionized our knowledge of the life of early man. In 1885 he began to search for old stone implements on the chalk plateau between the valleys of the Medway and the Darent. There, embedded in patches of gravel that must have been drifted on to the plateau from hills higher still, which had been already worn down by denudation even when palaeolithic hunters were roaming among herds of mammoths in the valley of the Thames, he found flints of divers shapes which seemed to him to bear sure traces of man’s handiwork, and which have been termed ‘eoliths’, or stone implements of a dawning age. Nearly all of them, indeed, were so rude that the chipping on their edges has been ascribed by sceptics to the action of nature. But if even a small fraction of them could be proved to be authentic, the contention of their finder would be established. They recur, again and again, in certain well-defined and peculiar shapes; the chips have in many cases been removed not from the exposed parts but from concave sides which, he would have us believe, natural agents could hardly have affected;[69] if Sir John Evans and other experts are unable to accept them as artificial, Canon Greenwell,[70] Pitt-Rivers,[71] and Prestwich[72] were convinced that they had been wrought by man; even the labourers who picked them out of the gravel hardly ever failed to distinguish them from the surrounding flints;[73] and, if we may believe the champions of their authenticity, those who assert that they were shaped by nature have failed to produce stones of similar forms from the valley-drift.[74] Now when the hunters of the Thames valley were making their tools, Britain had the same main features of hill and dale that it has to-day; but when the gravels were being drifted on to the Kentish plateau, Thames and Medway were yet unborn; and, filling the great valley that now lies between the North Downs and the Lower Greensand hills, some five miles further south, the plateau rose southward to Central Wealden uplands two thousand feet or more above the sea. With no special knowledge of geology the antiquary who spends a holiday in walking from Sevenoaks or Wrotham on to the plateau may satisfy himself that this is true. Mingled with the eoliths in the patches of drift are fragments of chert that must have been washed down from the Lower Greensand at a time when it rose high above the plateau’s level; for south of the eolithic area, inclining upward below the chalk and below the Upper Greensand, the outcrop of the Lower Greensand shows itself still. The plateau drift lies upon rock of preglacial age;[75] and although there is no evidence that it is itself older than the Pleistocene period, some geologists hold that it was deposited soon after, perhaps before, British glaciers began to form.[76]
But assuming that the eoliths are artificial, does it follow that they are older than the oldest palaeoliths, or that they were wrought by a race different from the men of the valleys? Mr. Clement Reid has pointed out that the gravel at Alderbury, some three miles below Salisbury, in which multitudes of eoliths have been found, is on exactly the same level as that of a gravel three miles lower down the valley, where Prestwich picked up a palaeolithic implement which had fallen from a yet higher elevation.[77] If the position of this implement was an index of its age, eoliths were being used in Wiltshire after palaeoliths had begun to be manufactured.[78] On the other hand, it is asserted that eoliths have lately been found in Tertiary deposits on the high plateau above the Avon;[79] and one geologist, who rejects all eoliths, would argue that Benjamin Harrison’s labours have not been vain. Many palaeolithic implements have been found on the Kentish plateau, but never embedded in association with eoliths: most of them are unworn, and look as if they had remained on the very spot where they were lost; and it is easy to see that they are far less ancient than the eoliths. But certain implements have also been found there which, although they were not lying in the gravels, appeared to bear marks of having been derived from them and washed down in the same drift that contains the eoliths. Like the latter they were stained deep brown, covered with glacial scratches, and coated with the white deposit of silica.[80] If this argument had been generally accepted, one might conclude that the greater antiquity of British man does not depend for its proof upon the authenticity of the eoliths. What all admit is that in France flints of eolithic form have been found even in Tertiary beds.[81]
But while the extreme antiquity of many eoliths is certain, the question of their authenticity has recently been debated with renewed and redoubled vigour. About two years ago an eminent French palaeontologist, Monsieur Marcellin Boule, announced that in the process of manufacturing cement at Mantes many flints had been converted into eolithic forms;[82] and it has been contended that the conditions which were actually observed in the factory were analogous to those of the torrential streams by which flints may have been dashed hither and thither as they were swept on to the Kentish plateau in primaeval times.[83] An ardent advocate of the authenticity of eoliths insisted that some of the Kentish types would be looked for in vain among the machine-made specimens from Mantes;[84] but a sceptic affirmed that he had himself found an eolith, manifestly untouched by man, with its notch accurately fitting against another stone, the two having been ground together by a natural process which he described as the slipping, sliding, and foundering of the insoluble surface material from higher to lower levels.[85] Although it was objected that certain rectangular eoliths with blunt edges could not have been produced except by art,[86] it is permissible to doubt whether the human origin of eoliths will ever be established beyond dispute; and he who reflects that they have been met with not only in Tertiary beds but in those immeasurably later deposits which were contemporary with or but little older than palaeolithic man[87] will leave them for the present without regret to the consideration of enthusiasts.
The environment of palaeolithic man in Britain.