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![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.
![Ulevn Camp around 1915.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/kvh_237-2.jpg?itok=_5pK0Vd7)
![Geologist William Helland-Hansen examining a quartz conglomerate in the Ulven Syncline on one of the hills by the north west end of Lake Ulvenvatnet.](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/os_31.jpg?itok=kdZe21Du)
Ulven
In the region of Ulven phyllite occurs with Hordaland's youngest fossils, and a beautiful quartz conglomerate. The phyllite and conglomerate got squeezed into the bottom of an ancient oceanic crust, made of gabbro and greenstone, in the heart of the Caledonide mountain chain.