Except the Great Flood would have been right around the time of Meltwater Pulse 1A, yes?
At least that was dated well before 6000 years ago. :^)
https://en.wikipedia.org/wiki/Meltwater_pulse_1A
I was just looking at Meltwater Pulse 1A.
MWP-1A is estimated to have caused a global sea level rise of approximately 14–20 meters over a period of 400–500 years, with rates up to 40–60 mm/year.
It occurred 14,700–14,300 years ago.
This rapid rise required the release of massive volumes of meltwater, primarily from the melting of major ice sheets like the Laurentide Ice Sheet (North America) and possibly contributions from the Antarctic Ice Sheet.
The total volume of water released during MWP-1A is estimated to be on the order of 5,000–10,000 cubic kilometers per year sustained over centuries.
MWP 1A preceded Noah by 9,000 years. The sea levels rose 0.1 to 0.2 feet per year during MWP 1A — hardly a catastrophic flood.