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![The rock paintings in Grødalshaug, Os](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/1/kvh_234-x.jpg?itok=3teSxvuP)
Grødalshaug
At the bottom of Vargavågen on Halhjem lies Grødalshaug, a 30 metres high rocky outcrop between the bay and a moist valley cleft. On the south side of the rock is a steep rock cliff facing the valley, the bog and the stream. On this rock face we find rock carvings from the Bronze Age.
![Hetlefloten i Os](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/232/723.jpg?itok=iwhgEn9w)
![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.
![From](https://www.grind.no/sites/default/files/styles/medium/public/bilder/sted/190/nvh_312_vaksinen_ulven_150.jpg?itok=P4DdHVu-)