In places, you can also see the sediment that was deposited on top of the gneiss about 540 million years ago. This consists of more or less rounded stones, many of quartz, that have been lithified to form a rock known as conglomerate. At first glance you may think this is just a piece of concrete. Above the conglomerate, sand was deposited and formed into sandstone. The best place to examine this is along the road leading down to the harbour. The sandstone contains traces of fossils of bottom-dwelling organisms. You can also see ripple marks – traces of the waves that hit the 540 million years old beach that once was.
These types of rock form the base of Kinnekulle, as well as the other table mountains in the region, and are evidence of an ancient sea, how it changed over time, and the early forms of life.