English: Jusi, eroded rest of the second largest volcano of 355 volcanoes of the „Urach-Kirchheimer Vulkangebiet“, also known as the "Swabian volcano" (wikipedia in German). These volcanoes were active only in Miocene; almost all of them are of the type phreatomagmatic eruption. But the Maars, which filled with water, have long ago dried out and eroded. In the landscape of the Middle Swabian Alb and its foreland the morphology is either full of small depressions of the Swabian plateau, all of them remnants of volcanic diatremes, or – in the foreland - heavely eroded buttes, where rests of the eroded White Jurassic and scree often covers the volcanic piperests.
The mountain is a nature reserve.