This locality shows gigantic blocks of volcanic rocks in the Devonian basin. The rocks are not remnants of a volcano that intruded into the basin. Instead, they are the result of one or more enormous rockslides, often called the Hersvik slide, which took place about 400 million years ago.
Some of the slide blocks are several square kilometres in size. At Skognipa, which lies about a 15-minute walk from the road, you can observe the lower contact between the conglomerate and one of the slide blocks. Another large slide block makes up the whole of Husefjellet.
