| Mnemonic | Eon, Era, Period, or Epoch |
| Here's | |
| A | |
| Profoundly | |
| Perplexing | |
| Puzzle, | |
| My | |
| Child: | |
| Camels | |
| Ordinarily | |
| Sit | |
| Down | |
| Carefully, | |
| My | |
| Pal. | |
| | Mnemonic | Eon, Era, Period, or Epoch |
| Perhaps | |
| Their | |
| Joints | |
| Creek | |
| Too | |
| Quietly. | |
| Perhaps | |
| Early | |
| Operation | |
| Might | |
| Prevent | |
| Premature | |
| Harm. | |
|