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in altitude from the lowest point on the Ruhr near Vorhalle (86 metres above sea level) to the highest point east of Bölling ?51° 18´ N, 7° 34´ E (438 metres above sea level) is 352 metres.

Geology and palaeontology

Since the early 19th century, the Hagen area has been regarded as a classic discovery region for palaeontology and archaeology

There are various rocks and deposits from the Devonian to the Carboniferous

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