I prefer not to change the legend to fit my ideas. I find it more rewarding to 'work' my ideas around the original legend.
* Generally I have found that the more distant in the past, the less we know about things. This works for Atlantis...all we know is something handed down from an Egyptian priest in 360BC.
* 9,000 years ago was the end of the last Ice Age, enormous changes were occurring with the shifting of the weigh of the melting ice. There would be great earthquakes, volcanos and floods. A good time for a civilization and large areas of land to disappear.
Plato wrote around 450BC and Solon Lived around 1500BC.