Slåttdalsskrevan by Geological Survey of Sweden SGU
This region is in our day principally known as a favored site for the observation of the phenomenon of post-glacial rebound. Most of the region was under the sea less than 10,000 years ago, after the ice sheet that blanketed it melted. But thanks to the melting of this mass of ice that had been pressing down upon it, the ground is rising year by year, at a current speed of 8 mm (0.31 in) per year.
The principal rock of the park is the granite of Nordingrå, the park belonging to the Nordingrå massif. It consists of a rapakivi granite, formed about 1.5 billion years ago.