Last seen in:
Related Clues:
- Rock hotel in auction
- Easily split layered rock
- Rock fracked for gas
- Barman has his tea in The Underground - it's course and grainy
- Fracking material
- Rock that's "fracked"
- Mud, after compaction
- Rock that underlies Manhattan
- Something fracked in fracking
- *Sedimentary rock
- Source of gas market includes hydrogen
- Fracking target
- Fuel oil source
- Rock that's fracked
- Fossil-yielding sedimentary rock