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The strata consist chiefly of red calcareous sandstones, with numerous veins in the place of layers, of gypsum; the sandstone is associated with some black calcareous slate-rock, and with green pseudo-honestones, passing into porcelain-jasper.
It is simply clay and sand baked, and often almost vitrified into porcelain-jasper. The stratification is gone; the porcellanite has run together into irregular masses, or fallen into them by the burning away of strata beneath; and the cracks in it are often lined with bubbled slag. But whence carne the fire? We must be wary about calling in the Deus e machina of a volcano.
The upper half of this gypseous formation is mainly formed of the same calcareous clay-shale rock, but without any gypsum, and varying extremely in nature: it passes from a soft, coarse, earthy, ferruginous state, including particles of quartz, into compact claystones with crystallised oxide of iron, into porcellanic layers, alternating with seams of calcareous matter, and into green porcelain-jasper, excessively hard, but easily fusible.
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