Marl pit
A marl pit is an artificially created depression that was used to mine marl . Marl pits are particularly common in Upper Normandy , in the chalk high plateau of the Pays de Caux .
Pays de Caux
In the 19th century, the Cauchois dug hundreds of shafts into the chalk layers of the plateau in order to mine the lower lying marl. The shafts were 10 to 30 meters deep and led to sections 10 to 20 meters long and 2 to 3 meters high. When the dismantling was completed , they were replenished. Their location could only be made out through trees that had been planted at this point. In the course of time (and because of the land consolidation ), these individual trees in the middle of wide fields have disappeared and with them the memory of these small mines.
Erosion and dissolution processes sometimes lead to subsidence and collapse, the so-called collapse sites .
Individual evidence
- ↑ Inhabitants of the Pays de Caux
- ↑ a b P. Auger, G. Granier: Le guide du pays de Caux. 1993, p. 36.
literature
- Pierre Auger, Gérard Granier: Le guide du pays de Caux. 4th edition. Editions La Manufacture, Lyon 1993, ISBN 2-7377-0280-1 .
- Patrick Lebourgeois: Pays de Caux. Vie et patrimoine. Editions des falaises, Evreux 2007, ISBN 2-84811-008-2 .
- Jacques Ragot, Monique Ragot: Guide de la nature en pays de Caux. Fécamp, éditions des falaises, 2005, ISBN 2-84811-035-X .
Web links
- Marnières, karst et cavités souterraines en Haute-Normandie (From the origins to the dissolution - inventories, safety zones , location, processing ...)
- Association pour la Defense des Victimes de Terrains à Risques et d'Information sur les Sites Dangereux