The Luxembourg Plateau – Luxembourg Sandstone
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08/2014 Leider kommt es in letzter Zeit immer öfters vor, dass ich Mails mit einer FALSCHEN Lösung erhalte. Vor Ort bei den Headerkoordinaten ist eine Tafel zu finden! Daher ist die Lösung eindeutig!! Es geht um diese ganz spezielle und seltene Formation des Sandsteines (die sich nicht googlen lässt)!!! Und nicht um Sandstein in der Region generell oder um dieses Tal! Sorry! Solche Logs kann ich nicht zulassen! Über 1800 Funde hats ja schon geklappt!
The Luxembourg plateau – Luxembourg Sandstone
The Luxembourg plateau is a large sandstone plateau in south-central of Luxembourg. It is the heart of the Gutland region. It was laid down in the Early Jurassic Epoch (about 180 million years ago), when the area was at the margin of a warm, shallow sea.
The Sandstone plateau is most often covered with loose sand and woods, so that it is very spongy and rains can quickly enter the ground. The rainwater is first entering the wood’s humus soil, which is playing a very protective role here by guaranteeing the water’s filtration. Then the water is crossing the spongy sandstone, with a thickness up to nearly 42 m.
This Luxembourg sandstone is a perfect water carrier all because of its numerous cracks and porosity.
At the meeting point of this sandstone layer and the psiloceras planorbis layer (stony and non permeable layer) the water can no longer continue its way down and precisely on this point the springs are rising out. The annual rain rate in Luxembourg is about 2 billion cubic metres from which 55% are evaporating, 41% flowing on the surface and only 4% can enter the soil to supply the ground water.
Most of these 4% are entering the sandstone layer, spreading over 493 square km but from which only 300 square km are spongy enough to let the waters enter. The other 193 square km are covered by stony and chalky layers and can not play the filtering role.
The Luxembourg sandstone is supplying Luxemburg with up to 90% of drinking water emerging from ground waters (in Luxembourg 2 thirds of all the drinking water is coming from ground waters and one third from surface waters).
Go to the header coordinates. There you can have a closer look at the sandstone and at his special form in this area. There you will also find an information board you will need to answer the question.
To log this cache as a found you have to
1) email me via geocaching.com in simple words what happened at the time of the formation of “Luxemburg Sandstone” (see the board 1 to 4) (please dont wait for my permission!)
2) Please please upload a photo that shows you or your GPS or only the landscape in this area. It reminds me of MY beautiful holiday there!
Sorry! I had to delete logs without answer emails.
I hope you enjoy this Earthcache!
PLEASE DO NOT SHOW THE TEXT FROM THE INFOPANEL IN YOU PICTURES!
(No hints available.)
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Coordinates are in the WGS84 datum