- for families
- for individual guests
- Pets allowed
- Free admission
Geology: The rocks in the Helletal consist of clay and siltstone from the Lower Fredeburg strata (Middle Devonian, approx. 390 million years ago) and have a clearly pronounced schistosity. Schistosity is a layered, planar texture in a rock and is formed when the rock is subjected to tectonic processes under high pressure and temperature. In the steep rock next to the path, you can see that the shale surfaces bend along a line. This phenomenon is known as buckling shale or buckling band. It occurs when the schistosity buckles along a zone of weakness due to high constriction pressure during rock formation. In the rock faces next to the path, almost horizontal, approximately 1 m long tubes can be seen in the rock. These were originally boreholes that were drilled to blast the rock for the construction of the path.