Geologisch Monument Zevenwegen
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A small outcrop of limestone from the cretaceous period. Parking is available at N50 46.062 E005 57.129
During the Cretaceous period (80 - 65 million Years ago) the South of Limburg was flooded by a Cretaceous ocean. During this flood, In this ocean, a thick layer of sand, clay and lime was deposited on the ocean floor. In the centuries that followed, the largest part of the limestone was eroded away through dissolution by rainwater that perculated through the topsoil. In the Vijlenerbos, a layer of 55 meters of limestone disappeared this way. What remained was the so called flintstone eluvium. These are the nondissolvable parts of the limestone. At a later time, sand and clay was washed between these flintstones. There are three layers of limestone that might be found in the viscinity. The most likely layer is the so called vijlen limestone, which appears on the surface at this site. On top of the Vijlen limestone, one might find a thick layer of Lixhe limestone. At the site, some of this might be present at the higher areas around. Lastly on top of that there used to be a layer of the Lanaye Limestone. this layer will be hard to find at this site, however on the higher areas in the forest one will be able to find this layer to crop. The questions to answer here are:
1.) How thick is the layer of sediment that was deposited at the cretaceous period.
2.) What type of soil can be found of top of the limestone layers according to the diagram.
3.) What is the chemical formula and the other name of the flintstone.
In het Nederlands:
1.) Hoe dik is de laag sediment welke in het krijt afgezet is.
2.) Welke grondsoort ligt bovenop de mergellagen volgens het diagram.
3.) Wat is de chemische formule, en ook de andere naam van de vuursteen.
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