temps (durée) (1) roche (1) région (1) calcaire (1) karst (1) fer (1) géologie (1) eau courante (1) effet (1) dissolution (1) grotte (1) calcium (1) Saint-Paul (1) Dissolution (1) Antiquities, Prehistoric (1) Ferric oxide (1) Wealth (1) Water (1) Walls (1) Units of measurement (1) Time (1) Sable (1) Quartz (1) Pebbles (1) Manganese (1) Prehistoric peoples (1) Limestone (1) Karst (1) Iron (1) Holes (1)