NEOLITHIC CHRONOLOGY
“WE must imagine Europe in upper Paleolithic times again as a terminal region, a great peninsula toward which the human emigrants from the east and from the south came to mingle and to superpose their cultures. These races took the grand migration routes which had been followed by other waves of animal life before them; they were pressed upon from behind by the increasing populations from the east; they were attracted to western Europe as a fresh and wonderful game country, where food in the forests, in the meadows, and in the streams abounded in unparalleled profusion.... Between the retreating Alpine and Scandinavian glaciers Europe was freely open toward the eastern plains of the Danube, extending to central and southern Asia; on the north, however, along the Baltic, the climate was still too inclement for a wave of human migration, and there is no trace of man along these northern shores until the close of the Upper Paleolithic, nor of any residence of man in the Scandinavian peninsula until the great wave of Neolithic migration established itself in that region.”[118]
We must now attempt to determine the succession of these great changes in the climate and face of Europe, and then see if we can fix any dates for some of the changes and for the introduction of new cultures.
In the oscillations of the ice-front marking the final retreat of the Alpine glaciers there were three epochs of advance. Two of these, the Bühl and Gschnitz advances, with the interval of retreat between them, were occupied by the Magdalenian or last epoch of Upper Paleolithic time. The third advance, the Daun Epoch, or perhaps the latter part of the Gschnitz and the first part of the Daun, is represented by the Azilian-Tardenoisian Epoch, a period of transition from Paleolithic to Neolithic time. These changes have been clearly traced by Osborn.[119]
We are most closely concerned with the changes which took place around the Baltic in Denmark and Scandinavia during this post-glacial retreat of the ice. Here also we find the same disappearance of the tundra and “barren-ground” fauna already noticed in France, and the appearance of a park-flora of forests interspersed with open glades or meadows. But we need not be surprised if we find that the retreat of the great Baltic or Scandinavian ice-sheet does not keep step exactly with that of the Alpine.[120]
1. The last ice-sheet had covered most of Scandinavia except the western half of Denmark and, perhaps, the most southern portion of Sweden. But a broad mass of ice covered most of Schleswig, at least the eastern half of Holstein, and a fairly wide zone of land south of and more or less parallel to the south shore of the Baltic. To the eastward and northward a great sea extended to the Arctic Ocean. This earliest stage marked the farthest advance of the ice just before the final retreat.
2. Slowly and gradually the ice retreated until finally it occupied only the mountains of the backbone of Scandinavia. The region of the Baltic Sea and the Gulf of Bothnia, a large part of Sweden and a good portion of Finland were covered by a great sheet of water, the Yoldia Sea, connected by a broad sound at the present Skager Rack with the North Sea and Atlantic, and still opening widely into the Arctic Ocean northeastward. The submerged regions had been greatly depressed, especially in the north. The clays deposited along the shores of the sea are now raised often to a height of one hundred metres above tide-level. But to the southward the depression was only slightly marked.
SUCCESSIVE STAGES AND FORMS OF BALTIC SEA