Because most Christians are willingly clueless about ancient transoceanic navigation (see Page titled Great Pyramid for Navigation), they have handed a gift to proselytizing by the Mormons who promote that fact of history in their otherwise baseless rendering, so Christians need to wake up to the fact that the Ice Age ended actually circa 1500 b. c. (about 900 years after Noah’s Flood), when settlements and stone ruins near the mouths rivers were consumed by the sea during approximately a century.
