From Plato's Timaeus:
“The genealogies which you have recited to us out of your own annals, Solon, are a mere children's story. For in the first place, you remember one deluge only, and there were many of them, and you know nothing of that fairest and noblest race of which you are a seed or remnant. The memory of them was lost, because there was no written voice among you. ”
Excerpt From: Plato. “Timaeus.” iBooks. https://itunes.apple.com/us/book/timaeus/id498663773?mt=11
The Egyptian priests stated that the Greeks only remember one deluge, when according the them, there have been many. They blame the lack of a written record as the reason for the lost memory.