In the 19th century, a roughly 40 meter wide and 22 meter high "quartz-poor porphyry" was visible through a quarry. About 290 million years ago, porphyry magma escaped explosively from the “Grunder column”. The material buried valleys and valleys and gradually cooled down. When cooling down, the volume decreased - first on the surface, then ever deeper. As a result, cracks formed until the columnar rock segregation ultimately emerged.
August 3, 2020
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