| Answer | Crossword Clue |
|---|---|
| IRONAGE | Early period in human history |
| IRONAGE | Period in human history |
| IRONAGE | Period in human history after bronze was supplanted in toolmaking |
| EOCENE | Period in early history. |
| IRONAGE | Period of human history that began about 3,000 years ago |
| STONEAGE | Period in human culture. |
| IRONAGE | Period in human development |
