espèce (1) sédiment (1) recherche (1) province (1) potasse (1) minéral (1) marqueur (1) gaz (1) champ (1) sédimentologie (1) Context (1) Variation (1) Area (1) Area (1) Employees (1) Units of measurement (1) Species (1) Siltstone (1) Sedimentology (1) Sandstone (1) Research (1) Red beds (1) Red (1) Potash (1) Population (1) Marks (Medieval land tenure) (1) Gray (1) Gas (1) Evidence (1) Orient (1)