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
Inside the Neolithic Mind island of Anglesey off the Welsh coast: Bryn Celli Ddu and Barclodiad y Gawres. Chapter eight, "Brú na Bóinne", examines the valley of the same name in County Meath, Ireland, the home to a number of Early Neolithic tombs. Lewis-Williams and Pearce turn their attention to the most prominent two, Newgrange and Knowth, arguing that their architectural designs reflect cosmological views of the world influenced by altered states of consciousness. In the penultimate chapter, "Religion de Profunais", the authors examine a number of recurring features in Neolithic Western Europe which they believe can shed light on the religious beliefs of