In the wall of the sunken road, hikers can discover a rare deposit of dark green to black grains. It is Vaalser green sand that gives the wall in this place a slightly green color. The green color comes from the mineral glauconite, once deposited here when South Limburg was still under water. Hikers who are lucky can also discover fossils here.
Want to know more about geological treasures? VVV Zuid-Limburg has published a walking map with the name 'Geological treasures in the Geuldal'. This is available at the Tourist Information Offices.
This text has been automatically translated using an online translation service.
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