Related Clues:
- Mineral layer involved in fracking
- Something settled long ago?
- Easily-split sedimentary rock
- Rock husband during auction
- Surface excavation
- Animal hunted in excavated area
- Extract, for example, stone from prey
- Prey; mine
- Excavated pit
- Flagstone material
- Small well in rock
- Hardly hard rock?
- Rock hotel in auction
- Easily split layered rock
- Rock fracked for gas