province (1) minéralogie (1) lixiviation (1) âge (1) argile (1) chimie (1) Chemical warfare (1) Composition (1) Weathering (1) Vermiculite (1) Soils (1) Shields (Geology) (1) Science (1) Rocks (1) Petrology (1) Paleopedology (1) Paleontology--Precambrian (1) Paleobotany--Precambrian (1) Mineralogy (1) Leaching (1) Kaolinite (1) Illite (1) Geology, Stratigraphic--Precambrian (1) Clay minerals (1) Clay (1) Chemistry (1) Chemical weathering (1) Cations (1) Beidellite (1) Age (1)