The area now known as Worcestershire has had human presence for over half a million years. Interrupted by two ice ages, Worcestershire has had continuous settlement since roughly 10,000 years ago. In the Iron Age, the area was dominated by a series of hill forts, and the beginnings of industrial activity including pottery and salt mining can be found. It seems to have been relatively unimportant during the Roman era, with the exception of the salt workings. Worcestershire is still important for agriculture, particularly in the Vale of Evesham.