Nok Iron Smelting
A notable aspect of the Nok culture (based in Kaduna State of Nigeria, 280-1 BC) was its advanced iron smelting technology, which had a wide-reaching impact on their tools and weapons. Interestingly, the Nok are among the few known civilizations to transition directly from stone tools to iron tools, without passing through the intermediate Bronze Age or Chalcolithic copper tool stages.