That's interesing, I don't believe the Basques were in Iberia when the Romans conquered it. The Solutreans were however in western Europe (and on the continental shelf, now submerged) between 23,000 and 16,000 BC; there's a gap between their *known* presence there and the apparent rise of a similar stone age toolkit in eastern North America. But again, at least part, and probably most of their development was on the continental shelf.
Doggerland?