Related Clues:
- Limestone cavern phenomenon
- Limestone, aka egg stone
- Limestone terrane
- Limestone rock formation
- Rock consisting of spherical grains
- Does oil in one's toe make it so hard and gritty?
- E. John's backing out of Italian rock
- Limestone variety
- Limestone landscape
- Land formation known for its caves
- Rock where two ducks perch, reportedly
- Grainy form of limestone
- Rough limestone country
- Rough limestone country with underground drainage
- Skater losing energy stumbling in rough limestone country