Describes the petrographic composition of moraines and fluvioglacial deposits of the Bigorre region, France, and proposes a chronology based on the petrography, degree of alteration of pebbles, and development of soil at the surface of each layer. Correlations are suggested for the deposits along the ancient courses of the Gave de Pau and the Adour, and also for the glacial stages of the Pyrenees in the Bigorre region relative to those of the Alps.

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