Abstract

Presents data on the distribution of the Pliocene and Quaternary in the western part of the Bresse region, France, obtained from 40 well borings, ranging from 7 to 17 meters in depth, in the vicinity of Pont-de-Vaux. Valleys cut in the Plaisancian (lower Pliocene) blue clays during later Pliocene times are filled with Quaternary deposits. The changes in level causing dissection and filling seem to have been produced by tectonic processes associated with the Alpine crustal movements, which caused subsidence in the west-central part of the region and uplift in the south, rather than by eustaticmovements.

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