The grinding tracks of Frebershausen

 

Where 320 million years ago strong currents dragged dead plant parts over the mudflat-like bottom, today these drag marks are documented in solid rock on a steep slope!

The primeval plant remains drifting on the seafloor left lines in the ground, on which sediment layers were laid down again. Over millions of years, these sediments solidified with the plant trace fossils preserved in them to form solid rock.

Over time, the seafloor was folded by tectonic forces and lifted to the surface. Today, the former seafloor represents parts of the local low mountain range landscape.

The trace fossils were exposed by quarrying activities for forest road construction in the 20th century. After forming for millions of years, these testimonies of past currents are now in the process of disappearing. Due to inflowing water, the track-bearing sediment layer is slowly bursting and crumbling away.

For the GrenzWelten Geopark, these traces are of great importance, which is why a geostation was set up there in cooperation with the Kellerwald-Edersee National Park. A geological trail also leads past the former quarry.