Atlantes Known to the Classical Greeks a Thousand Years After the Ice Age Ended in Region of Atlas Mountains

The Classical Greek historians Herodotus and Diodorus Siculus wrote about the Atlantes who lived in the region of the Atlas Mountains in their day, about a millennium after the world ocean had risen at the close of the ice Age, yet we are expected to believe the Atlantes (Atlanteans) had lived in that region for 9,000 years, or was Plato actually relating 9,000 months (horas meaning segments of time)?