Nordic Bronze Age objects. These valuable metals were all imported, primarily from Central Europe, but they were often crafted locally and the craftsmanship and metallurgy of the Nordic Bronze Age was of a high standard. The archaeological legacy also comprise locally of crafted wool and wooden objects and there are many tumuli and rock carving sites from this period, but no written language existed in the Nordic countries during the Bronze Age. The rock carvings have been dated through comparison with depicted artifacts, for example bronze axes and swords. There are also numerous Nordic Stone Age rock carvings, those of northern Scandinavia mostly
Neolithic and Bronze Age rock art in the British Isles to similarities with Bronze Age petroglyphs in Galicia and Valcamonica. Conversely, many rock art researchers do not consider them to be prehistoric, with Saward arguing that they were created between the 16th and 18th-centuries, when the neighbouring Trewethett Mill was operational. As evidence, she noted that labyrinths were a popular motif in folk customs at the time, and that the good state of preservation would not be present if they had prehistoric origins. Cup-and-ring marks are particularly common in this area. Petroglyphs can be found carved onto Early Neolithic passage tombs, such as Newgrange. Throughout the British Isles, most of