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 the research into rock art has been undertaken by amateurs rather than professional archaeologists, to varying degrees of quality. In 1997, archaeologist Richard Bradley of the University of Reading published "Rock Art and the Prehistory of Atlantic Europe", the first study of such petroglyphs across Atlantic Europe. In 1999, Stan Beckensall published "British Prehistoric Rock Art", the first regional overview of the island's rock art. The purposes of Neolithic and Bronze Age petroglyphs in the British Isles have long been debated, with amateur rock art researcher Ronald Morris listing 104 different proposals that he had encountered, ranking them according to