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 tomb Neolithic tomb The Neolithic tombs of Northwestern Europe, particularly Ireland, were built by the Neolithic (New Stone Age) people in the period 4000 - 2000 BC. There are four main types: All these types of tomb were built from large slabs of rock which were uncut or worked only slightly. In each case, there was a "doorway" made from two large stones facing each other. The doorway led to an inner chamber, or a passage and chamber, lined with flat slabs. In all but the portal dolmens, the tomb was then covered in earth and small stones to make a