View of Calverbühl

The Calverbühl (also Calver Bühl, formerly Karpfenbühl) is a striking 509 m above sea level elevation south of Dettingen an der Erms in the district of Reutlingen. On the summit of the Calverbühl there is a linden tree that is clearly visible from afar. Until the Reformation in 1534 there was a chapel up here. The Calverbühl Chapel was a regular destination for the people of Dettingen on St. Mark's Day (April 25th) for a pilgrimage.
The Calverbühl is a small volcanic vent of the Swabian Volcano. The rock is characterized by numerous lapilli. Geophysical measurements have shown that a strong geomagnetic anomaly occurs on the Calverbühl, which is caused by the ferromagnetic minerals (especially magnetite) present within the volcanic rock.
In a recent publication, Otto Mäussnest mentions that the magnetism of the Calverbühl was increased by lightning strikes. The Calverbühl with the lime tree on the summit and the semi-dry grassland on the slopes is a protected natural monument and is also protected as a geotope under the name Calverbühl, about 1000 m south of Dettingen a. d. Erms on the western slope of the Ermstal. It is embedded in both the Reutlinger and Uracher Alb landscape conservation area and the Swabian Alb biosphere reserve.

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