@talk72000,
Quote: the glaciers may have provided a land bridge across the northern Atlantic. The sea levels were lower by 200 or 300 feet.
The deepest portion of the North ATlantic is about 17000ft to 20000ft. The area I like for a crossing goes from the Coastal plain and Conshelf of Britain and the Iberian OPeninsula to the Flemish Cap and Newfoundland That Still leaves an ocean margin of at least 2000 miles. How many years just to cross?
The geochemistry of the points and the genetic data is quite strong NOW. The "data on the crossing" is still pretty bogus and noone has presented any good ideas (IMHO).
Ive heard the "coasting" story. How were skin boats maintained for the voyages.
Ive heard the overland story-In an area of pressure ridge ice and shifting margins, the journeys would be extreme to say the least.
There was no Gulf STream and the temps were like the margins of Nunavit today. DId the crossers take generations while living like present day Innuit?
Did they travois all their other resources? (like lithic material to make replcement tips and branches for spears?) .How large were the groups, families, extended families? Did they travois all the stuff for shelter or did they represent those who introduced an Innuit lifestyle (Bone tools,oil fule, skin shelters and ice cave dwellings).
My own ideas include the fact that the ice had lowered the sea level by about 250 ft on avg. BUT, the downwarping of the continental margins due to the weight of ice caused these huuge coastal muskegs and permafrost areas. The areas Noirth of the Biscay Abyssal is , to me, an area that archeologists should look in dragnets to see whether there are any artifacts that had been drowned by unsuccessful crossers.
Interesting topic that will probably get more legs what with this petrographic data on projectile point source areas.