The New Stone Age, approximately 12,000 to 2500 years ago. The period of the Stone Age following the Mesolithic, characterized in Europe by polished stone tools, pottery and the evolution of food production. In northern Africa, the period that commenced between 12,000 and 5,000 years ago, and lasted into the time when iron was first smelted, about 2,500 years ago. Unlike the Palaeolithic, where more than one human species existed, only one human species - Homo sapiens - reached the Neolithic.