EDGAR CAYCE - MIGRATIONS FROM ATLANTIS

At the time of each distruction and particularly for the last distruction, Cayce referred to migrations from Atlantis.  These migrations were to the lands bordering Atlantis, including the Americas, Europe and Egypt:

"....Evidences of this lost civilization are to be found in the Pyrenees and Morocco on the one hand, British Honduras, Yucatan and America on the other.  (no.364-3,
February 16, 1932.)
"....Hence....establishments in the Yucatan, in the Luzon, in what became the Inca, in the North American land and in what later became known as the land of the Mound Builders in Ohio. (no.1215-4, June 4, 1937)
"....The entity was among those who set sail for the Egyptian land but entered into the Pyrenees and what is now the Portuguese, French and Spanish lands.  And there still may be seen in the chalk cliff there in Calais the marks made by the entity's followers....(no 315-4, June 18, 1934)

We will first look at the migrations to the New World, then at Europe and defer Egypt to the next chapter.  The Cayce readings gave specific dates for migrations from Atlantis:

- 50,772 BC (no 262-39, February 21, 1933)
- 28,000 BC (no 470-22, July 5, 1938)
- A range of dates between 10,000 BC and 11,000 in a large number of readings for the final distruction.  We have seen that there is some geological support for major earth  changes near these dates. 

Is there any evidence that people existed this long ago in the Americas, and that
there were major migrations at the times given by Cayce?