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Le Calcaire de Saint-Ouen

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Fig. 14. - Noter la présence <strong>de</strong> bancs <strong>de</strong> gypse au mur et au toit <strong>de</strong> la couche. Ces niveaux,<br />

d'épaisseur variable, contiennent une nappe assez abondante, qui provoque leur dissolution.<br />

Gypse<br />

c<br />

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