446 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 4, 



In the environs of Eisleben, however, where numberless smkmgs 

 have been made to extract ore from the underlying copper-slate, the 

 miners observe with minute precision the mineral character of every 

 layer of the deposit. The underlying rock is the " Weiss-Liegende," 

 which, as before said, forms the natural base of the Zechstein. This 

 light greyish pebbly bed, of about 3 or 4 feet in thickness, is at 

 once conformably covered, as on the flanks of the Thiiringerwald, 

 by the Kupfer-schiefer with its fossil fishes and peculiar flora, all of 

 which are here contained in a thickness of 2 feet. This is sur- 

 mounted by a little shale and impure limestone, and then by about 

 28 feet of anhydrite and gypsum, and the overlying succession is 

 made of the alternations of rocks locally called "Asche," "Stink- 

 stein," and " Rauch-kalk." 



The lower portion of the Bunter-Sandstein, which immediately 

 rests on the Zechstein, clearly exhibits a passage into it, and forms 

 its natural cover. The lowest of these beds near Eisleben consist of 

 greenish calcareous shale, with concretions of impure limestone, 

 similar to some of the immediately underlying beds of Rauchstein 

 and Stinkstein. Again, in some of the red and green beds, thin 

 courses of coaly matter have been found (Gerdstedt). 



Looking, then, at the similarity of these features to those of strata 

 having the same position in the Thiiringerwald, we necessarily adhere 

 to the Permian classification already proposed. 



Secondary or Mesozoic Rocks. — Though it does not enter into 

 our present plan to describe the succession of secondary rocks, 

 whether triassic, Jurassic, and cretaceous, or of the older tertiary 

 rocks, which, flanking the granite of the Brocken and the Ross- 

 Trappe, and their associated slaty rocks, constitute the mural, broken, 

 and occasionally inverted bands to which attention was formerly * di- 

 rected, we think it right, in taking leave of the Harz, to say a few words 

 respecting these younger rocks, if only to show what great movements 

 have affected all the strata from the Bunter-Sandstein to the Upper 

 Chalk inclusive, if not also certain older Tertiary strata. 



The Bunter-Sandstein of the Trias, N. of the Harz, contains a very 

 remarkable band of ferruginous pisolite, the "Rogenstein" of the 

 Germans, which to the east of Ilsenburg is exposed in vertical 

 bands f . 



Above this rock, and between it and the Muschelkalk, is a lighter- 

 coloured and often yellowish sandstone, in which Saurians occur, in- 

 eluding the Trematosaurus, the finest specimens of which have been 

 detected at Bernberg, in the north-eastern extension of this for- 

 mation. 



Of the Muschelkalk we will only say that its upturned edges are 

 admirably displayed towards the north-eastern end of the flank of 

 the Harz, b3tween Ballenstadt and Quedlinburg, flanked by the 

 Keuper sandstone. 



Above the Trias, the Lias of Quedlinburg is copiously rich in fos- 



* Trans. Geo!. Soc. 2 ser. vol vi. p. 291. 



t One, if not others, of the magnificent old churches of Brunswick is built of 

 this " Rogenstein." 



