Possible Clues:

• Go, senate to ancient era before metal was discovered
• Step one is to go through a period in history
• It started about 2 1/2 million years ago
• Solomon, say, hosts character for a period
• Primitive period's general character comprehended by ancient
• Hard times of long ago (5, 3)
• Attitude evident in wise man before copper came in
• Period that ended with the advent of metalworking
• Fred and Barney's time
• Neolithic time