The Sablière du Bois de Comblain mainly consists of white, yellow, and ochre sand and some purplish clay layers. This sand deposit is part of a depression of carbonaceous limestone. The sand comes from the last sea that covered our area about twenty-five million years ago, during the Tertiary period. Not many traces of this last sea remain. The sand that settled on the bottom is not petrified. After the retreat of the sea, wind, rain, and especially rivers had free rein to wash the sand away. In a few places, the tertiary sand escaped erosion, such as in this very unique location. The tertiary sand was extracted by humans. And now this old quarry has been colonized again by vegetation adapted to this sandy soil. The soil is very poor in mineral salts.
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