Though the relative age of the beginning of civilisation on the Nile and the Euphrates is yet an uncertain matter, still it is clear that the unification of Egypt long preceded that of Babylonia. The earliest date of the scattered Sumerian kings is about that of the fourth dynasty; the earliest Semitic dynasty—Sargon and Naramsin—was contemporary with the ninth dynasty, and the rise of the dynasties of Babylon is of the later Hyksos age of the sixteenth dynasty.
Sea-shore Moved 47 Miles
EUPHRATES VALLEY. The conditions of the Euphrates valley are very different from those of the Nile. On the Egyptian coast the river runs into a strong current in the Mediterranean, which sweeps away its sediment and prevents any continuous growth of the coast. But the Mesopotamian rivers reach the sea-level at the head of a deep bay, the Persian Gulf, and hence there has been a continuous formation of new land at the estuary. The Mesopotamian valley and the Persian Gulf form one long drainage valley gently sloping down to a distance about twenty miles outside Hormuz, where the valley bottom drops suddenly three miles into the floor of the Indian Ocean. The slope of this valley so far as submerged, is about 1 ft. to the mile, and it is probably even less in the Babylonian plain, where sea-shells are found as far up as Babylon. This valley has been filled, and the sea-shore pushed downward, 47 miles in 2,200 years, or 115 ft. yearly, since Spasinus Charax—now Mohammerah—was founded on the shore in the time of Alexander. The account of a sea expedition to Elam by Sennacherib is usually interpreted as showing a more rapid growth; but in the uncertainty how far he went down a channel before entering the Persian Gulf, it is not decisive.
How far back the extension of land has been going on, and whether it was continuous to above Babylon, has not yet been proved. The appearance of the map much suggests that the original drainage bed ended—i.e., the valley was submerged—at about the nearing of the two rivers by Sippara, and that all below this is the filling up of the estuary. Should this growth have extended uniformly back so far, it would give limits to the possible ages of cities—5000 B.C. for Eridu, 8000 B.C. for the whole plain of Shumer, 10,000 B.C. for Nippur, and earlier for the site of Babylon. This would bar the southern region from being as old as Memphis, and Eridu was probably open sea when Menes laid out his capital.
THE PLAIN OF BABYLONIA: ITS EXTENT AT DIFFERENT PERIODS IN HISTORY
This map shows how the Plain of Babylonia has been extended down by silting since 10,000 B.C. The dotted lines, marked 330 B.C. and 1830 A.D., show the known positions of the coast, as it shifted by silting up. These give an approximate scale of dating for the coast-line of earlier ages, which is marked here at each thousand years.
RANGE OF CIVILISATION. In looking for the earliest movements of people that we can trace, it seems that the Semites must have extended from Northern Arabia into Upper Mesopotamia and Assyria. In short, Semitica stretched up to the mountain ranges of Armenia and Media. But the culture was barbaric, and probably they were nomads who had no fixed centres of life or stable organisation which could resist any united movement. At this period the Persian Gulf probably extended as far as Babylon. On their eastern flank were the mountain tribes, in what is known as Parthia and Media, south of the Caspian. How remote is the beginning of civilisation in this region has been found in the last few years. On the north-east extremity of Parthia, in the far end of Hyrcania, stands a group of mounds, near the modern Askabad, not far from the celebrated Turkoman stronghold of Geok Tepe. Here are 14 ft. of town ruins with iron, 15 ft. with copper and lead, about 70 ft. of ruins with wheel-made pottery and domesticated animals, and 45 ft. of remains with only rude hand-made pottery. What ages these represent we cannot judge until the full account by Prof. Pumpelly is issued. But in any case a very long period is involved. If the accumulation is at the rate found in Palestine, 4½ ft. per century, the periods would be perhaps 1,500 years for the wheel pottery, and 1,000 years for the rough pottery, before the beginning of the age of copper.
At the other side of these countries stands the great mound of Susa, with over 80 ft. of ruins. The inscriptions show that about 26 ft. of the height was accumulated between about 4500 and 500 B.C., or in about 4,000 years. Yet before that there is a depth of about 50 ft. comprising three periods. In the upper of these is elementary cuneiform writing on tablets. Below that is a period of rather rough, thick pottery, painted with chequer patterns and closely-crossed lines, of the style common in early Syria and Cyprus. And at the bottom of all is a great quantity of very fine, thin wheel-made pottery of buff tints, with decoration of thin diagonal lines, rows of ostriches, and various patterns all derived from basket-work.