11. Older gypsum, a rock totally wanting in the other districts of the mines of Rothenberg; but abounding in Saxon Mansfeldt, where it includes vast caverns known among the miners by the name of schlotten, as indicated in the figure.
12. The calcareous rock called zechstein. The lower part of this stratum shows symptoms of the cupriferous schist that lies underneath. It presents three thin bands, differently modified, which the miner distinguishes as he descends by the names of the sterile or rotten (faüle) rock; the roof (dachklotz); and the main rock (oberberg.)
13. Is a bed of cupriferous schist (kupferschiefer), also called the bitumino-marly schist, in which may be noted, in going down, but not marked in the figure:—
- a, the lochberg, a seam 4 inches thick.
- b, the kammschale, 1⁄4 of an inch thick.
- c, the kopfschale, one inch thick.
These seams are not worth smelting; the following, however, are:—
- d, the schiefer kopf, the main copper-schist, 2 inches thick.
- e, a layer called lochen, one inch thick.
14. The wall of sandstone, resting upon a porphyry.
[Fig. 735.] is a section of the mines of Kiegelsdorf in Hessia, presenting—