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![At lake Gaupåsvatnet.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/190/nvh_334_gaupas_koronitt_150.jpg?itok=Wq7ffNPu)
![](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/berg_12_0.jpg?itok=hv7XxFE6)
![A zone with nuggets from the inner earth.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/auste_26.jpg?itok=6s7Qo0xH)
![Gneiss.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/sam_25.jpg?itok=1PhE0wUc)
![Soft shapes in the hard mountain.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/samnanger.jpg?itok=TBH6DVLU)
![Gullbotnen](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/sam_18.jpg?itok=dlJQCo79)
Gullbotnen
A barren belt where almost nothing grows, runs through the forest on the east slope of Gullbotnen. But, along the west side of the main road there is a fertile zone that flourishes with several finicky plant types. The contrasts arise from the extreme variations in the nutrient content of the bedrock.
![Lurøyane](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/lindas_26.jpg?itok=20iNP_Fs)
![The geology along Oster Fjord and further eastward, in cross-section and on the surface. (Haakon Fossen)](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/304/stall_english.png?itok=1uke2PrO)
Stall
The Bergen Arcs have an unusually sharp boundary to the bedrock in the east. Geologists think that this was caused by movements in the earth's crust during the Devonian Period. Then, the Bergen Arcs on the Lindås peninsula sank a whole 10 kilometres in relation to the Precambrian basement gneisses on the east side of Fens Fjord and Aust Fjord.
![From the mountainous rocks just below Sandvikshytte cabin on Sandviksfjellet.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/304/sandviksfjellet_berg_42_0.png?itok=ojW0mG7e)
Sandviksfjellet
On Sandviksfjellet there are old boulders that have been made into mountains. The stones have been stretched out or squeezed together between huge slabs of rock, during slow, but powerfulprocesses of transport. This conglomerate shows, in quite a special way, the enormous powers that were active during the collision between Norway and Greenland over 400 million years ago.
![Skerries with a long history](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/auste_15.jpg?itok=MU10Q3lW)
Møkstrafjordøyane
The sea keeps the bedrock in the outer skerries smooth and clean. When the bedrock is also varied and interesting, the setting is perfect for a discovery tour of these bare-faced outcrops.