In the main chamber is an inscription dated to 1115, indicating that an altar was consecrated here.
The third room is the so-called Kuppelgrotte is reached from the main chamber and via a small passage from the outside.
It appears to have been intended to receive a relief made from some other material and then set into the stone.
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The next one, II, is also known as Turmfels (tower) and rises 37.5 m (123 ft) above the surrounding area.
The geological formation consists of a hard, erosion-resistant sandstone (so-called Osningsandstein), laid down during the early Cretaceous era about 100 million years ago, near the edge of a large shallow sea that covered large parts of Northern Europe at the time.
For scientific purposes, these have been numbered I-XIII from northwest to southeast with the most imposing being stones I-V.