32 GEOLOGICAL MEMOIRS. 



On some of the Iron-ores of Styria. By M. F. von Hauer. 



[Proceed. Imp. Geol. Instit, Vienna, May 1857.] 



With regard to the iron-mines in the Tragoss Valley, near Bruck, 

 in Styria, M. von Hauer observes that crystalUne rocks appear in the 

 lower portion of this valley, the upper part of which is formed of 

 grauwacke, overlaid by grauwacke- slates and limestones, separated by 

 a zone of Werfen-slates and conglomerates from the still higher cah 

 careous masses, of more recent origin. The iron-mines are in the 

 highest portion of the grauwacke-rocks, the same which, at a di- 

 stance of from 18,000 to 24,000 feet to the west, contain the inex- 

 haustible stores of carbonate of iron, w4iich are worked in the Erz- 

 berg near Eisenerz. A rich bed of ironstone, increasing in value and 

 thickness with the depth, has been opened by the Kegelang mine, 

 and is imbedded in and alternates with grauwacke-slate. Its total 

 thickness is 12 feet ; and its extent, as indicated by outcrops, is more 

 than 600 feet. The carbonate of iron is associated with white anke- 

 rite and quartz. The best sort of ore gives above 40 per cent., and, 

 after roasting, above 60 per cent, of iron. 



A group of ferriferous beds lately discovered to the south of the 

 Zober-Kogel, between grauwacke-limestone and variegated sandstone 

 with their conglomerates, is of still greater importance. The total 

 thickness of this group is above 200 feet. The ores are very calca- 

 reous ; those gathered at the surface give nearly 20 per cent, of iron ; 

 a solid mass of ore gave 36*4 (after previous roasting, 5 1*9) per cent. 

 The ore may therefore be expected to become more productive at a 

 greater depth, and to be advantageously mixed with the softer and 

 quartziferous ores of Kegelang in smelting. 



[Count M.] 



On the Black Coal q/*CosiNA. By M. Fcetterle. 

 [Proceed. Imp. Geol. Instit. Vienna, May 1857.] 



Black-coal occurs at Cosina, two and a half Austrian (about twelve 

 English) miles south-east of Trieste, and at Yrem and Skoffle, near 

 that city. In the first of these cases, the deposit is a lenticular mass, 

 its greatest diameter being from 30 to 36 feet, and its thickness not 

 more than 2\ feet. Another mass, of scarcely greater importance, 

 has been opened at a distance of about 600 feet from the first. Both 

 are imbedded in the lowest part of a black bituminous limestone, 

 containing Upper Chalk fossils, and very similar to the well-known 

 ichthyolitic calcareous slates of Corea. This limestone rests on Hip- 

 purite-limestone, and is overlaid by Nummulitic limestone, on which 

 reposes an eocene sandstone, commonly called " Macigno" or *'Tas- 

 sello." 



The geological position of the coal at Verm and Skoflfle is identical 

 with that of Cosina, but it occurs in such scattered and limited de- 

 posits that it is not worth working. [Count M.] 



