Die Geschichte des Flußnetzes in Norddeutschland und angrenzenden Gebieten

Paul Woldstedt
The river systems of North Germany show a characteristic alternating of peripheral („Urstromtäler") and centripetal ways („Durchbruchstäler"). The valley sections going to the north seem to be of especial importance. Mostly ancient river valleys, they were leading for the advancing ice, which conserved, and often deepened, them. In these channels dead ice was buried which, after melting, gave the rivers access to their ancient valleys.