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Rg. 7. — Marne blanche du sommet<br />
du calcaire <strong>de</strong> <strong>Saint</strong>-<strong>Ouen</strong>. (Collecteur<br />
<strong>de</strong> Vincennes - 5 e lot - Puits 20).<br />
<strong>Le</strong>s traces <strong>de</strong> pelle indiquent une<br />
certaine plasticité <strong>de</strong> ce matériau.<br />
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