>> As for the other suggestion, that would involve the mammoth task of crossing the ices
>> of Greenland during the post-ice age.
Not necessarily a tough task. In the 1800s Scottish fishermen used to encounter Inuits in kayaks & umiaks in the middle of the North Atlantic. Good boats will allow you to follow the edge of the ice by sea and not have to cross it on foot. The similarities between the Inuit umiak and the Irish curragh are astonishing.
http://www.civilization.ca/aborig/watercraft/wau02eng.html
http://www.oldirishimages.com/irish%20life/curraghs/curraghs.html
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