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Fossiles
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Collection de fossiles des grottes de Savonnières.
Un fossile est la trace plus ou moins minéralisée d’un ancien organisme vivant conservé dans une roche sédimentaire.
Dans la vallée de la Loire le tuffeau est le résultat de la lente et longue transformation du sédiment en roche, par cimentation de particules fossiles entre elles.
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