| Answer | Crossword Clue |
|---|---|
| DARKAGE | Period of human benightedness |
| STONEAGE | Period of human culture. |
| IRONAGE | Period of human culture. |
| STONEAGE | First known period of human culture. |
| EOLITHIC | Related to the earliest period of human culture |
| IRONAGE | Period of human history that began about 3,000 years ago |
