Tepe's oldest structures are about 7,000 years older than the Stonehenge megaliths, although it is doubtful that any of the European megalithic traditions (see below) are derived from them. Middle Eastern megaliths Dolmens and standing stones have been found in large areas of the Middle East starting at the Turkish border in the north of Syria close to Aleppo, southwards down to Yemen. They can be encountered in Lebanon, Syria, Iran, Israel, Jordan, and Saudi Arabia. The largest concentration can be found in southern Syria and along the Jordan Rift Valley; these are threatened with destruction. They date from the late Chalcolithic or Early Bronze Age. Megaliths have also been found on Kharg Island and Pirazmian in Iran, at Barda Balka in Iraq. A semicircular arrangement of megaliths was found in Israel at Atlit Yam, a site that is now under the sea. It is a very early example, dating from the 7th millennium BC. The most concentrated occurrence of dolmens in particular is in a large area on both sides of the Jordan Rift Valley, with greater predominance on the eastern side. They occur first and foremost on the Golan Heights, the Hauran, and in Jordan, which probably has the largest concentration of dolmen in the Middle East. In Saudi Arabia, only very few dolmen have been identified so far in the Hejaz. They seem, however, to re-emerge in Yemen in small numbers, and thus could indicate a continuous tradition related to those of Somalia and Ethiopia. The standing stone has a very ancient tradition in the Middle East, dating back from Mesopotamian times. Although not always 'megalithic' in the true sense, they occur throughout the area and can reach 5 metres or more in some cases (such as at Ader in Jordan). This phenomenon can also be traced through many passages from the Old Testament, such as those related to Jacob, the grandson of Abraham, who poured oil over a stone that he erected after his famous dream in which angels climbed to heaven (Genesis 28:10-22). Jacob is also described as putting up stones at other occasions, whereas Moses erected twelve pillars symbolizing the tribes of Israel. The tradition of venerating standing stones continued in Nabatean times. Related phenomena, such as cupholes, rock-cut tombs and circles, also occur in the Middle East. European megaliths The most common type of megalithic construction in Europe is the portal tomb—a chamber