| Answer | Crossword Clue |
|---|---|
| STRATA | Layers of rock |
| SHALES | Layers of rock. |
| STRATA | Layers of rock. |
| STRATAL | Of layers of rock. |
| FOLIA | Thin layers of rock |
| STRATA | Layers of rock, e.g. |
| STRATA | Rock layers |
| STRATA | Rock layers. |
| FOLIA | Rock layers |
| SEAMS | Rock layers |
| STRATA | Sedimentary rock layers |
| SHALE | Rock made in layers |
| STRATIC | Pertaining to rock layers |
