14 GEOLOGICAL MEMOIRS. 



back its origin no earlier than to the existence of the Sahara, whence 

 it comes ; and, according to Hitter's showing*, the Sahara was a sea 

 at a comparatively late period. 



[T. R. J.] 



On the Distribution of the Metalliferous Ores in Servia. 

 By J. Abel. 



[Jahrb. d. Reichs-Anst. 1851, vol. ii. p. 57 et seq. ; and Leonhard u. Broun's 

 Jahrb. f. Min. u, s. w. 1852, p. 736.] 



In nearly all the valleys throughout the mountainous part of the 

 country, there are heaps of scoriae and other traces of the former 

 extent of the mining works which were carried on under the Roman 

 government. In the Maidanpek district in the mountain-ranges of 

 Staritza and Pomont Valalb, and more than a mile [German] long by 

 500 to 600 fathoms [Klafter] broad, mica-schist prevails. The ores are 

 found ha a vein of syenitic porphyry of more than 100 fathoms. 

 Limestone occurs on the heights, but it only here and there extends 

 down into the valley, and forms steep precipitous rocks, especially 

 where a mining tovra stood and where the ruins of a church are still 

 seen. In the syenitic porphyry vein traversing the mica-schist are 

 colossal vein-blocks of copper-ore, grey copper-ore, blue carbonate of 

 cojDper, siliceous malachite and copper-pyrites, also brown ore and iron- 

 pyrites, and lead-glance. Not far from Milanowatz the mica-schist 

 contains garnet in abundance, and imbedded layers of hornblencUc 

 rock. The Rudna-Glawa mine was worked on a 4-fathom vein of 

 magnetic iron, garnet, copper- pyrites, and carbonate of copper. Here 

 the geognostic conditions are manifold, as at Maidanpek ; Limestone, 

 Serpentine, Clay-slate, Syenite, Mica-schist, and Granite occur. Below 

 the village of Kuczama is a deserted mine, which was worked for 

 argentiferous lead-glance in the porphyry traversing syenite and 

 limestone. 



[T. R. J.] 



* Erd-Kunde, 1817, vol. i. p. 396-403. 



