L'évolution des nappes alluviales antérissiennes de la Garonne, dans l'avant-pays molassique

Abstract

Description and analysis of the Garonne pre-Riss deposits. Mindel alluvial pebble weathering is shown by : strong weathering of crystalline material ; clay formation and argillic development ; genesis of kaolinic minerals but very disorderly ; water-tighting of pebble alluvions . . . Gunz materials are little more weathered but Donau alluvions are extremly weathered, with important amounts of well crystallized kaolinic minerals. Iron-crust genesis and origin of silt cover are discussed.