Related Clues:

• Period in human history after bronze was supplanted in toolmaking
• First millennium B.C., approximately
• Third and last epoch of the three divisions of European prehistory
• Period in ancient history
• When steel was first forged
• It followed the Bronze era
• Early tool-making period
• Period piece central in Thirsk on decline
• Primitive era of heavy metal ...
• Period in which Press Association guides electorate initially
• *Toolmaking period when bronze was replaced with steel