The carvings were divided into five separate groups by Professor Knut Helskog, of the Department of Cultural Sciences at the University of Tromsø. Using shoreline dating, the earliest carvings were dated to around 4200 BC; the most recent carvings were dated to around 500 BC. In 2010 researcher Jan Magne Gjerde pushed the dates for the oldest phases back by 1000 years. The wide variety of imagery shows a culture of hunter-gatherers that was able to control herds of reindeer, was adept at boat building and fishing and practiced shamanistic rituals involving bear worship and other venerated animals.