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Related Clues:
- Rock used in walls
- Fossil-yielding rock
- Rock made from layered mud
- Slate, originally
- Fossil source
- A source of oil
- Slate source
- Oil-producing rock
- Clay product
- Most common sedimentary rock
- Fine-grained sedimentary rock
- Fine pieces of stone on leash
- Stone that splits easily into fine pieces
- Layered sedimentary rock
- Small, pert child holding small rock