This anticline - which you can admire nearby Durbuy's Old Town - is known as Homalius' Rock or the 'Roche à la Falize'.
Anticline is the geological term for this particular type of U-shaped rock formation.
In exactly the same way as the Wavreille anticline, the layers of this dome-shaped fold were formed by layer upon layer of sea-sediments accumulating during millions of years. The thus formed layers appear at the surface in longitudinal strips that are symmetrical in relation to the axe of the crease. The sheer weight of the superimposed strips ends up turning into stone the sediments contained in the calcium carbonate that makes up at least 50% of limestone. The ceaseless movements of the earth's crust and the incessant overlaps and creases created by the continental drift end up creating anticlines
This particular anticline is over 300 million years old! The highest point of the city is located on the summit of this impressive rock formation.