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.