The lithostratigraphic classification of the Quaternary deposits is based on the genesis of the sediments. The distinguished environments are marine - estuarine, fluvial, eolian and slope. The marine - estuarine deposits are restricted to certain time-intervals within the Quaternary and are limited to the northern part of Belgium. Fluvial deposits are found throughout the Quaternary. On the basis of the sedimentological - lithological differentials within the Meuse basin and the Schelde basin a bipartite subdivision of the fluvial deposits is introduced. Eolian deposits are differentiated on the basis of their grain size distribution, namely sand and silt. The sandy deposits are accumulated in the northern part of Belgium, whereas loess is deposited in the more southern part of the country. Slope deposits are not restricted regionally neither temporally.

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A resistivity survey in Wenner arrangement has been conducted in the water-table aquifer in the eastern part of the Coastal Area of Belgium. Bore holes have been drilled to test the geoelectrical data and also to collect water samples. The chemical characteristics and the distribution of different water types explain the hydrochemistry of the water-table aquifer. The fresh-/brackish-water boundary as determined by the resistivity survey has been expressed in terms of total dissolved-solids content. RESUME Une prospection geoelectrique d'apres la disposition de Wenner a ete effectuee dans la nappe phreatique de la partie orientale de la region cotiere de la Belgique. Les donnees geoelectriques ont ete controlees par des forages, qui ont egalement servi au prelevement d'echantillons d'eau. Les caracteres chimiques et la distribution des types d'eau expliquent l'hydrochin1ie des eaux phreatiques. La limite de salinite, detectee par sondages electriques, a ete precisee en teneur en sel totale.