At a few localities in the Fontenayle-Comte and Niort quadrangles, on the northern border of the Aquitaine basin, in the Deux-Sevres region, France, fluviatile deposits up to 10 meters thick are found between the peneplaned Paleozoic basement and the Hettangian (Jurassic) limestone. Plant remains in these Infraliassic sands have been identified as Hettangian. The sands were deposited on the peneplain in wide, shallow, north-south-trending channels. As the Hettangian sea transgressed, it easily penetrated these channels, first depositing lenses of limestone together with the uppermost sands, at the same time leaving trains of pebbles against the low divides, and subsequently covering the whole area with a uniform layer of limestone.

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