The Marxenklamm forms an approximately 140 meter long narrow section of the Ramsauer Ache from the end of the magic forest to behind the Marxenbrücke. In this area, the average width of around 10 meters is reduced to less than half, thus ensuring a significantly higher flow speed and water whirlpools on the irregularly shaped walls. In these whirlpools, the stones from the Klausbachtal that are transported in the water rub against the rock walls and thus create smooth depressions on the walls and in the ground (so-called “scours”).
In the gorge, two mountains with different types of rock face each other: the Reiter Alpe and the Hochkaltermassif. In this fault zone, the Dachstein limestone meets on the south side with the overlying Liaskalk from the Hochkalter andwerfen layers of the Reiter Alpe, with the Dachstein limestone dipping at an inclination of around 30 degrees beneath the much olderwerfen layers.