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The cut leather surrounding the holes would have been tied around the wooden branches of the A-frame with finer strips of leather.The sails would have likely been made from the skins of the giant irish reindeer with the skins being scraped clean and sewn together.The hunters then probably turned to horses and the giant irish deer for food.12 000 years ago the giant irish deer which these hunters hunted in southern France were becoming scarce and these hunters knew this.The reason being for this is that after menstruation and child birth, they needed protection from the cold and other weather elements to raise and feed thier children.This is probably where the women, over thousands of years, obtained the recessive genotypes like lighter skin and hazel eyes, although not necessarily the dominate phenotype of the O blood factor which they most likely picked up 5-6000 years earlier when they ventured out of Siberia on thier way to northern and southern Europe.The famous Irish archaeologist Michael O'Kelly wrote: "In the Post-glacial Stage which commenced about 10,300 years ago the climate again began to improve and thus began the present warm stage' in whic we now live".It is likely that the upper palaeolithic or mesolithic hunter-gatherers of the Pyrenees and Andorra Spain ventured to the bay of Bisacy 12 000 years ago and started building thier ocean ships.
The first people to settle on the west coasts of the Atlantic Islands 11000 to 10 000 years ago were likely the support crews for the reindeer hunters of Finnmark in Arctic Norway, who needed safe harbours, resting places, supply and repair services for thier ocean transport ships.
Indeed, during the maximum glaciation at around 18 000 BC, south-west Europe may have served as a refuge area for Palaeolithic populations where the shift in the thermal gradient enhanced offshore fishing on the Cantabrian coast.
It is about this time that probably some of the big game such as bison, wooly rhinocerus, and mammoth would have been hunted to extinction while the lions who hunted these prey became extinct also.
What these were made of is uncertain, however it's quite possible that they used large logs made from oaks or pine that were doubled on top of one another where they were tied down with soft springy saplings that were split lengthwise and bent over the logs horizontaly to the top and the underside.
These springy saplings with pliability were then tied at the ends together with leather similar to how a gripper bar raft is made.