This "mountain" was formed in the third era (70 millions years
ago). During this time the sea came and went and each time left
something behind. The light yellow sand "Tongeriaans zand" was
deposited 34 million years ago. Here you can find some
"limonietbanden" of oxidate iron. In the sand you can find many
fossilized wormholes. When the Tongeriaanze see withdrew it left
some small flat silex pebbles behind. Hereupon some
"Diestiaanszand" was deposited. All the Hagelandse hills are
northeast- southwest oriented . They are fossilized sandbanks that
lay parallel with the shoreline of the at that time the
DiestiaanseSea. When the sea retreated some 7 millions years ago
the sandbanks came in contact with the air and the iron in the sand
started to oxidate and formed the brown red sandstone. These stoned
sandbanks withstand the erosion over the years that formed these
valley's. You can find the sandbank from here till the north sea.
People started to extract the iron and later on used it to build
churches, castles en fortified walls. You can see this in Leuven
were the city walls has the same structure as the stones you can
find here.
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