The slabs of rock with a polished surface observable at this point also belong to the Auernig Formation. On these rocks dark circles about one centimetre in diameter can be frequently found and are sections of excavation tracks (Skolithos) of invertebrate animals that once populated the sedimentary areas close to the coasts. With a little luck it is possible to identify another type of track (Psammichnites) about a centimetre wide bearing a median line. A snail-shaped mollusc with an organ similar to a proboscis is believed to have produced this track when going in search of food.