| Answer | Crossword Clue |
|---|---|
| MARINE | Kind of geology |
| AEON | Division of geology |
| ESKER | Ridge of gravel, in geology. |
| EON | Largest division of time, in geology |
| STOSS | Side of a hill, in geology. |
| EON | Longest division of time, in geology |
| AZOIC | Before the appearance of life, in geology |
