An elliptical pressure-arch cavern in gypsum interbedded in the St. Ouen limestone and marl of Ledian (upper Eocene) age was discovered in 1960 by workmen repairing the pavement of a street in Paris, France. Caverns and collapsed galleries are well known in the overlying gypsum of Ludian (upper Eocene) age, but this discovery demonstrates their existence in the St. Ouen limestone-marl, and also possibly in the Beauchamp and Monceau sandy and gravelly marls. Exploratory drilling is required prior to construction involving any of these strata in which subterranean solution caverns in gypsum might occur.

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