Geology of the Bergen area
Sometimes people ask about the geology of the Bergen area, or the Bergen Arcs, which is the name given to the series of arcuate metamorphic rocks that swings around the city of Bergen. Here is some basic information that you may find useful as a starting point.
The Bergen Arcs is a tilted stack of Proterozoic and Lower Paleozoic rock units that define a large fold structure that is clearly visible from topographic maps, geologic maps and satellite images. The rocks generally show a pronounced foliation or metamorphic layering that strongly influences the location of valleys and ridges (mountains), which makes the arcuate structure quite conspicuous from topographic maps and satelite images alike.
Two of the arcs, known as the Minor and Major Bergen Arc, contain Upper Cambrian to Ordovician greenstone, metagabbro and metasediments interpreted as dismembered ophiolite fragments, overlain by sheared Upper Ordovician – Silurian metasediments. The Minor Bergen Arc (in which the city of Bergen is located) is narrower and contains more intensely strained rocks than the wider and longer Major Bergen Arc. It also contains a higher number of mylonitic basement slivers(gneisses).
Between the Major and Minor Bergen Arcs are the Proterozoic Blåmanen and Lindås Nappe, the latter containing Caledonian shear zones where Sveconorwegian (Grenvillan) granulites, many of anorthositic composition, are transformed into eclogite. A number of publications can be found from this area, many of them coauthored by Håkon Austrheim at the University of Oslo.
Here are some localities that may be of interest:
1: Folded and faulted mylonites, Verftet
This locality contains a clean cut through beautifully sheared and folded mylonitic gneisses belonging to one of several basement slices that were tectonically shuffeled together with Paleozoic rocks of the Minor Bergen Arc. These rocks are exposed at Verftet, Nordnes, north of downtown Bergen (loc. 1 on map).
Mylonitic gneiss, where the mylonitic foliation is folded and affected by shear zones and fractures (5.308756E 60.39608N).
2: Deformed conglomerate, Sandviksfjellet
If you are interested in strained conglomerates, this one is a must: Hike the steep mountain slope N of the downtown area, from Sandviken Sykehus (hospital) up to Sandvikshytten. Below this cottage the strained and folded conglomerate described in publication 2 is located. Following the conglomerate through a tight map-scale fold we can observe a change in state of strain from flattening through constriction and back to flattening. 
Strained quartz conglomerate, Sandviksfjellet (upper picture: 5.329188°E 60.423431°N, lower picture: 5.328071°E 60.424691°N)
The youngest metasediments in the arcs are found in the Ulven area (loc. 4) near the town of Os. Phyllites containing (rare) fossils are overlain by quartzite and quartz conglomerate (Ulven conglomerate), all intruded by lamprophyric dikes; 
There are many places to study the gneisses along the North Atlantic coastline to the west of the arcs. Toftøy (loc. 6) north of Sotra is a particularly good one. In this area there are well-exposed post-Caledonian brittle faults, such as the road section toward Turøy, and there are beautiful folds in the heterogeneous gneisses that are worth a visit. (4.93059°E 60.479922°N and 4.931267°E 60.482456°N).
Structural geology
