[blam]

"A sudden refreeze happens. The Sa'ami find they can travel to America along the edge of the winter sea-ice (eating seals the whole way), and arrive there just in time to find all the large game dead, the sabertooth tigers and direwolves expired (from want of game), and the world to themselves as the TOP PREDATOR."

The Red Paint People?

[muawiyah]

BTW, the reason the Sa'ami could travel along the Southern edge of the Winter sea ice from the Western Refugia to the Grand Banks would have been the disappearance of the Gulf Stream and other currents due to the stoppage of haline circulation by all that tremendous outflow of freshwater into the Mid and North Atlantic.

Without those currents the icebergs breaking out of the sea ice wouldn't have gotten much momentum ~ making travel in a small boat relatively safe even in mid-ocean. I would imagine this would even have a serious impact on hurricanes and that would have extended the sailing time into the warmer months giving the Sa'ami plenty of time to reach America.

I think we can come up with a specific date for when the first Europeans could have arrived in America via an Atlantic route now.