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
Pre-Pottery Neolithic Neolithic B (PPNB 7600 BCE - 6000 BCE). These were originally defined by Kathleen Kenyon in the type site of Jericho (Palestine). The Pre-Pottery Neolithic precedes the ceramic Neolithic (Yarmukian). At 'Ain Ghazal in Jordan the culture continued a few more centuries as the so-called Pre-Pottery Neolithic C culture. Around 8000 BCE during the Pre-Pottery Neolithic A (PPNA) the world's first town Jericho appeared in the Levant. PPNB differed from PPNA in showing greater use of domesticated animals, a different set of tools, and new architectural styles. Work at the site of 'Ain Ghazal in Jordan has indicated a later