In the southern part of the country are dwelling sites dating from about 5,000 BC. Finds from these sites give a clearer idea of the life of the hunting and fishing peoples. The implements vary in shape and mostly are made of different kinds of stone; those of later periods are more skilfully made. Rock carvings (i.e. petroglyphs) have been found, usually near hunting and fishing grounds. They represent game such as deer, reindeer, elk, bears, birds, seals, whales, and fish (especially salmon and halibut), all of which were vital to the way of life of the coastal peoples. The rock carvings at Alta in Finnmark, the largest in Scandinavia, were made at sea level from 4,200 to 500 BC and mark the progression of the land as the sea rose after the last ice age ended.