Ridge and furow occurs in France, Sweden, Denmark and Germany and other
countries though I have never seen a map of its distribution. North and
East France was classic champion country of nucleated villages surrounded
by large open fields comprising strips strips - so ridge and furrow would
not be surprising on the heavier soils. I have seen furrow bottoms in
excavated Carolingian sites in NE France but I imagine a lot has gone
under the agri-industrial farming regimes of that part of the world.
However, not all open fields had ridge and furrow.