Prehistoric technology Ground and polished stone tools continued to be created and used during the Neolithic period. Numeric record keeping evolved from a system of counting using small clay tokens that began in Sumer about 8000 BC. The Stone Age developed into the Bronze Age after the Neolithic Revolution. The Neolithic Revolution involved radical changes in agricultural technology which included development of agriculture, animal domestication, and the adoption of permanent settlements. The Bronze Age is characterised by metal smelting of copper and its alloy bronze, an alloy of tin and copper, to create implements and weapons. Polished stone tools continued to be
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