The original Europeans who carried the rhesus negative blood factor 35 000 years ago are probably the original Europeans who painted the comic strips and other art in the caves of southern France and northern Spain which includes the Chauvet-Pont-d' Arc cave and the Lascaux cave paintings found in the Pyrennes.The rhesus negative blood factor is a recessive phenotype while the O rhesus positive factor is a dominant phenotype.It is quite possible that they may have brought pigs and goats because they could survive with little care in the coastal forests and they seem to do well together since pigs eat roots and tubers while goats can eat small twigs, branches and lichens.The west coasts of Ireland and Scotland which presently have moors would have looked like forests since the warm gulf stream would not have had a full effect at this stage.Black wavy hair, brown eyes, copper to brown tanned oily skin are dominant phenotypes which the men who drew these cave paintings most likely possessed.The women most likely possessed dominant features as well but probably had hazel eyes and slightly lighter skin which may have been less oily.The weather appears to have been considerably better than it is today as O'Kelly wrote: "In circa 9,600 BP, the Boreal Phase, birch was still present but hazel began to expand greatly.The lowlands and lower mountain slopes became covered in woodland and the heath lands seem to have disappeared.
This Late Palaeolithic population is thought to have been relatively open with regard to mating networks, and mutations could have circulated among the founder populations of Spain and the British Isles.
It's also possible the skins would have been made from smaller reindeer hides, but this seems unlikely since the hunters had sought and favoured the larger irish reindeer, and the coracle placed on top of the raft would have been too small.
Whatever the ocean ships were made of, the hunter-gatherers sought reindeer and knew they lied north of the Bay of Biscay and set out to sail from there.
It is positively sure that a few of the O rhesus positive women joined the O rhesus negative tribe, but a lot of the women travelling to southern Europe just below the Swiss alps likely still had the O rhesus negative factor while those travelling north of the glaciated Swiss alps likely had the O rhesus positive factor.
This may explain why a lot of Spanish and Italians presently have dark hair as opposed to the Germans and French who have lighter complexions and blond or blonde hair.