The type of underlying rock can be decisive for how many different types of plants are found in an area. In the area around Hamlagrø-lake the diversity is especially obvious. The geological conditions change much here within a short distance.
"And here these endless kingdoms and these toils for a rich working life far and wide have lain and slept for a hundred thousand years! Right up until the Voss Railway came in 1883 and woke them, like the prince in the fairytale who awakened the Sleeping Beauty."
The different bedrock types that got shoved in over Hordaland in Cambro-Silurian times still remain, layer by layer, almost like a cake. But at Kvamskogen the cake has been turned upside down.
Folds are to be found everywhere in the remains of the Caledonian mountain chain. Some were formed during the collision with Greenland, others stem from the time when the mountain chain collapsed. Few can compare with the giant fold that remains in the mountain area around Tørvikenuten, Vesoldo and Hellefjellet.
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.
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.
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.
Hårteigen, «the grey signpost», as the name suggests, is a landmark for mountain hikers on the western plateau. The piece of mountain is also a monument for the mighty rock layers that once covered the entire plateau.
At Flintaneset by Finnåsvika, in the centre of the municipality, we find the most beautiful and best preserved igneous rocks in western Norway. We must go to Hawaii or Island to find as fine structures as at Bømlo.