The "Roche à l'Appel" bordering the Givonne Cambrian mountain massif (570 million years) is the centre of the nature preserve of the non-profit organisation called "Ardenne – Gaume". This escarpment of heavy pudding-stone which emerged from the secondary sea is the only witness of the basic layers of the Gedinnian age, known as the foundation of Mondrepuits.
Faults at the spot where mountains of the palaeozoic era meet the "Paris basin," revealing 400,000,000 year-old conglomerates.
In structural geology and geomorphology, a "slope" is a ridge formed by gently tilted sedimentary rock strata in a homoclinal structure. "Slopes" have a steep slope, where the rock layers are exposed on their edges, called an escarpment or, if more steep, a cliff. Usually an erosion-resistant rock layer also has a more gentle slope on the other side of the ridge called a 'dip slope'.
The neighbouring forest it is a very pleasant setting. Two trails lead to the top of the "Roche à l'Appel", offer an outstanding view of the nearby Ardenne forest and the first two slopes (geology also called Homoclinal Ridge or ......). To the north, there is the estate of Amerois, which used to be owned by the Count of Flanders (father of King Albert I). Along the Monty path, it is possible to see, in the distance, the castle owned by the Solvay family.
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