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The petroglyphs were carved on a granite rock face that was once part of an island, meaning people would have had to make the carvings while standing on a boat, or from a platform constructed on ice, said Martin Ostholm, a project manager with the Foundation for Documentation of Bohuslan's Rock Carvings who is one of the archaeologists who discovered the petroglyphs, told Live Science.Bohuslan is already known for its rock carvings, including Bronze Age art made at Tanum... The team was looking for new petroglyphs in the area when they came across the moss-covered rock face. They noticed some...

Bronze tools found in Sweden dating from 3,600 years ago were made using copper from the Mediterranean, archaeologists have shown. They now also believe that rock carvings of ships found in Bohuslan, Sweden were visual documentation of trade between ancient Scandinavia and the Mediterranean. Most of the copper circulating in Bronze Age Europe apparently originated from Sicily, Sardinia, the Iberian peninsula - and Cyprus, going by isotope analysis... The precious copper was exchanged for Nordic amber, which was as cherished as gold in Mycenaean Greece and in the prehistoric Middle East... The ancient Cypriot copper industry produced relatively pure stuff,...