roche (1) fleuve (1) province (1) méthodologie (1) magnétisme (1) analyse (1) champ (1) âge (1) grotte (1) Afrique (1) Variation (1) Methodology (1) Accelerator mass spectrometry (1) Stone age (1) South Africa (1) Sand, White (1) Methodology (1) Mesolithic period (1) Magnetite (1) Geomagnetism (1) Magnetism (1) Hand (1) Carbon--Isotopes (1) Age (1) Optically stimulated luminescence (1) Age (1) Analysis (1) Areas (1) grotte (1) main (1)