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Updated: May 23, 2025
The second formation is composed of fibrous gypsum, placed either in the molasse or new sandstone, or between this and the upper limestone. It abounds in common clay, which differs essentially from the salzthon or muriatiferous clay. The third formation of gypsum is more recent than chalk. To this belongs the bony gypsum of Paris; and, as appears from the researches of Mr.
It is remarkable enough, that this stratum of clay, as well as the banks of pure sal-gem and the salzthon in Europe, scarcely ever contains shells, while the rocks adjacent exhibit them in great abundance. Although the muriate of soda is not found visible to the eye in the clay of Araya, we cannot doubt of its existence.
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