Karst in the Netherlands.
1993
Swart H.W. de
98 per cent of the Netherlands consists of quaternary sediments such as sand, clay and peat. In two small areas, however, we find older rocks and even some karst: the Winterswijk area with Muschelkalk (Triassic) and the southern part of Dutch Limburg with cretaceous chalk. Some lapies were found (and destroyed) during quarrying activities in Winterswijk, but in Limburg a relatively large area with interesting karst phenomena still exists, threatened as well. The karst area comprises 160 km of underground quarries, dolines, geological "organ pipes" and some natural passages or caves (with a length of 70 m).
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