In the northern part of Stenshuvud National Park, a large shingle field splays out into the hornbeam forest. Here you will find the most highly elevated beach ridges, a full 32 metres above today’s sea level.
The mountain itself is an inselberg, an isolated mountain formed when surrounding, more easily eroded types of bedrock fell away over millions of years. The mountain consists of dense porphyry and gneiss. In some places the gneiss is coarse-grained, with large quartz and feldspar crystals. There also are pegmatite dikes here containing radioactive minerals. Along the precipices, there are landslide sections where erosion continues to occur at a very slow pace.