10.5 The Flooding of the Mediterranean Valley¶
So far we have been telling of a history without events, a history of ages and periods and stages in development. But before we conclude this portion of the human story, we must record what was probably an event of primary importance and at first perhaps of tragic importance to developing mankind, and that was the breaking in of the Atlantic waters to the great Mediterranean valley.
The reader must keep in mind that we are endeavouring to give him plain statements that he can take hold of comfortably. But both in the matter of our time charts and the three maps we have given of prehistoric geography there is necessarily much speculative matter. We have dated the last Glacial Age and the appearance of the true men as about 40,000 or 35,000 years ago. Please bear that “about” in mind. The truth may be 60,000 or 20,000. But it is no good saying “a very long time” or “ages” ago, because then the reader will not know whether we mean centuries or millions of years. And similarly in these maps we give, they represent not the truth, but something like the truth. The outline of the land was “some such outline”.
There were such seas and such land masses. But both Mr. Horrabin, who has drawn these maps, and I, who have incited him to do so, have preferred to err on the timid side. We are not geologists enough to launch out into original research in these matters, and so we have stuck to the 40-fathom line and the recent deposits as our guides for our postglacial map, and for the map of 12,000 to 10,000 B.C. But in one matter we have gone beyond these guides. It is practically certain that at the end of the last Glacial Age, the Mediterranean was a couple of land-locked sea basins, not connected — or only connected by a torrential overflow river. The eastern basin was the fresher; it was fed by the Nile, the “Adriatic” river, the “Red-Sea” river, and perhaps by a river that poured, down amidst the mountains that are now the Greek Archipelago from the very much bigger Sea of Central Asia that then existed. Almost certainly human beings, and possibly even Neolithic men, wandered over that now lost Mediterranean valley.
The reasons for believing this are very good and plain. To this day the Mediterranean is a sea of evaporation. The rivers that flow into it do not make up for the evaporation from its surface. There is a constant current of water pouring into the Mediterranean from the Atlantic, and another current streaming in from the Bosporus and Black Sea. For the Black Sea gets more water than it needs from the big rivers that flow into it; it is an overflowing sea, while the Mediterranean is a thirsty sea. From which it must be plain that when the Mediterranean was cut off both from the Atlantic Ocean and the Black Sea it must have been a shrinking sea with its waters sinking to a much lower level than those of the ocean outside. This is the case of the Caspian Sea today. Still more so is it the case with the Dead Sea.
But if this reasoning is sound, then where today roll the blue waters of the Mediterranean there must once have been great areas of land, and land with a very agreeable climate. This was probably the case during the last Glacial Age, and we do not know how near it was to our time when the change occurred that brought back the ocean waters into the Mediterranean basin. Certainly there must have been Grimaldi people, and perhaps even Azilian and Neolithic people going about in the valleys and forests of these regions that are now submerged. The Neolithic Dark Whites, the people of the Mediterranean race, may have gone far towards the beginnings of settlement and civilization in that great lost Mediterranean valley.
Mr. W. B. Wright  gives us some very stimulating suggestions here. He suggests that in the Mediterranean basin there were two lakes,
one a fresh-water lake, in the eastern depression, which drained into the other in the western depression. It is interesting to think what must have happened when the ocean level rose once more as a result of the dissipation of the ice- sheets, and its waters began to pour over into the Mediterranean area. The inflow, small at first, must have ultimately increased to enormous dimensions, as the channel was slowly lowered by erosion and the ocean level slowly rose. If there were any unconsolidated materials on the sill of the Strait, the result must have been a genuine debacle, and if we consider the length of time which even an enormous torrent would take to fill such a basin as that of the Mediterranean, we must conclude that this result was likely to have been attained in any case. Now, this may seem all the wildest speculation, but it is not entirely so, for if we examine a submarine contour map of the Straits of Gibraltar, we find there is an enormous valley running up from the Mediterranean deep, right through the Straits, and trenching some distance out on to the Atlantic shelf. This valley or gorge is probably the work of the inflowing waters of the ocean at the termination of the period of interior drainage.
This refilling of the Mediterranean, which by the rough chronology we are employing in this book may have happened somewhen between 30,000 and 10,000 B.C., must have been one of the greatest single events in the pre-history our race. If the later date is the truer, then, as the reader will see plainly enough after reading the next two chapters, the crude beginnings of civilization, the first lake dwellings and the first cultivation, were probably round that eastern Levantine Lake into which there flowed not only the Nile, but the two great rivers that are now the Adriatic and the Red Sea. Suddenly the ocean waters began to break through over the westward hills and to pour in upon these primitive peoples — the lake that had been their home and friend became their enemy; its waters rose and never abated; their settlements were submerged; the waters pursued them in their flight. Day by day and year by year the waters spread up the valleys and drove mankind before them. Many must have been surrounded and caught by the continually rising salt flood. It knew no check; it came faster and faster; it rose over the tree-tops, over the hills, until it had filled the whole basin of the present Mediterranean and until it lapped the mountain cliffs of Arabia and Africa. Far away, long before the dawn of history, this catastrophe occurred.
|||The Quaternary Ice Age|