Acheulian implements in Nok valley gravels radiocarbon-dated

Carbonised wood from the gravels which produced Acheulian implements in the Nok valley yielded a radiocarbon date of more than 39,000 years before the present, but this is only a minimum age. The gravels form the earliest of three erosional/depositional cycles in the valley; the second infill contains Middle Stone Age material and the third contains the iron-using Nok Culture terracottas.