| Answer | Crossword Clue |
|---|---|
| OIL | Shale extract |
| OIL | Shale .... |
| STRATA | Shale features |
| TAR | Shale distillate |
| SLATY | Like shale. |
| STRATA | Shale layers |
| KOLM | Swedish shale |
| TAR | Shale product. |
| KEROSENE | Shale oil product |
| OIL | Product of shale. |
| TAR | Product of shale. |
| SLATY | Made of shale. |
| SYNFUEL | Gas from shale |
| OIL | Shale or whale product |
| KEROGEN | Source of shale oil |
| SYNFUEL | Shale oil, for instance |
| LONGAS | Features of shale and slate? |
| LAMINATES | Mica, shale, and butcher block |
