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The geological site called “Trollpikken” (which is Norwegian for “the Troll´s penis”) lies between Kjervall and Veshovda in Eigersund municipality.

Formation of Trollpikken

About 110.000 to 10.000 years ago, most of Norway was covered by a large ice sheet up to several kilometers thick. At the end of the last Ice Age the ice retreated and advanced at different times. Melting water from the retreating glacier ran into existing cracks in the mountains. When water freeze, it expands. The pressure that is applied to a rock by the expanding ice causes the rock to crack even more. This is called frost weathering and is a term for mechanical weathering. When the ice sheet melted away the overlaying pressure earlier caused by the ice disappeared. This resulted in a release in pressure, which again facilitated even more cracks to form. These two mechanisms, together with a bit of luck, lead to this special and unique rock formation called Trollpikken. The Trollpikken has been erect since the end of the last Ice Age – almost 10.000 years!