Über fluviatile Kiese in Nordwestdeutschland

In the east of the Netherlands a kind of gravel is to be found, not deposited by the Rhine (non-Rhine gravel) being older than the Riss groundmoraine. In order to trace the origin of this material, a number of samples was collected in North-Western Germany. Most of the gravel analysed was of a size from 5 to 8 mm in diameter and of each sample about 300 gravel particles were examined. The investigation revealed that...