When Alexander the Great circa 325 b. c. was campaigning in the Indus river valley, his biographer Aristobulus ventured out into the Great Indian Desert and discovered over eight hundred ancient settlement sites scattered across that vast desert landscape, settlements of the Indus Vally Civilization which had declined a thousand years before that time, desertification obviously because of catastrophic climate change, confirmed by the ruins of Kushasthali submerged in the Gulf of Kutch (Kush) and two vast cities on either side of the now defunct Sarasvati river submerged in the Gulf of Cambay (Ham), submerged when the Ice Age ended circa 1500 b. c, the timeframe of the Hebrew Exodus out of Egypt.
