JUS ILC ATE OIN-S: 
Lie Entstehung der Blet-, Zink- und Etsenerzlagerstitten in Ober- 
schlesien.. Eine Besprechung von H. H6FeErR.  Separat- 
abdruck aus der ‘‘Oesterreichischen Zeitschrift fur Berg- 
und Huttenwesen.” XLI. Jahrgang, 1893. 
This very interesting paper is itself a review of three publications 
by Kuntzel, Fr. Bernhardi and Rich. Althans, which were presented at 
the Breslau meeting of the Verein der Allegemeinen Deutschen 
Bergmanstage, all treating of the ore deposits of Upper Silesia. 
These important deposits, from which have been derived by far the 
greater part of Germany’s zinc output, are briefly and excellently 
described by Althans, as follows: 
“The ores of the Upper Silesian Muschelkalk* are principally galena, 
zinc-blende, smithsonite, marcasite and limonite. These occur in 
bed-like deposits in the dolomite of the Lower Muschelkalk, the beds 
being usually more or less connected. Generally two beds, or 
deposits at two different horizons, can be distinguished: one imme- 
diately above what is known as the Sohlenstein and separated from it 
only by a bed of slate known as Vitriolletten, or by a layer of dolomite 
which is seldom over one or two meters thick; the other in the mass 
of the dolomite at a very variable distance above the first. The upper 
one is of much more irregular distribution than the lower; in the 
Trockenberg basin it is indeed almost entirely absent. Both are in 
part purely lead-bearing, but they are then rarely more than a meter 
thick, and at the same time are much interrupted; in part they are 
predominantly zinc-bearing, and in this case they are much thicker 
and occur more frequently as continuous beds. The lead-bearing 
beds belong principally to the Trockenberg basin, the zinc-bearing 
almost exclusively to Beuthen. In both, the whole thickness is not of 
compact ore, but this is almost always intermixed with dolomite, which, 
in fact, generally makes up the mass of the ore body. Where the 
deposits are zinc-bearing, the lower portion consists mostly of zinc- 
* Lower Triassic. 
344 
