Most of the salt harvested then was natural salt from the sea or from natural salt deposits and contained the beneficial trace mineral iodine. (globalhealingcenter.com)
Even more severe droughts occurred much longer ago, accompanied by salt deposits up to 150 feet (45 meters) thick, researchers said at the meeting. (news.nationalgeographic.com)
The team concluded that at that point in history, the Dead Sea nearly vanished: The lake evaporated, leaving salt deposits in the process as water levels fell about 2,300 feet (700 m) until only a beach remained. (livescience.com)