420 PROCEEDINGS OF THE ACADEMY OF [1897. 



stone dipping to the southeast and constituting the " mountain " 

 Silitour. In the neighborhood of Koussinsk also are interesting 

 examples of the limestones with the foliated bosses often heretofore 

 referred to. These limestones belong to the middle Devonic 

 (horizons DI b with Spirifer Anossofi, and Di; a with Pentamerus 

 bashkiricus). 



On July 30-( August 11), the train was run back from Slatooust 

 on the road some 20 kilometers to the "platform" (flag station) Kous- 

 sinskaja, and the excursionists were taken in droschkes twelve wersts 

 south to an exploitation of a mine called Schichimskaja Gora. This 

 was simply a cut in the face of the hill of 100 feet or more in width, 

 exposing talc and chlorite slate cut by porphyritic diorite. Many 

 minerals occur at this contact, which may be found described in 

 L. G. IV, 3 -(-. Returning to the platform, we started after breakfast 

 to the town and smelting works 14 wersts north of Koussinsk, where 

 the pretty iron ornaments sold in Slatooust are made. The start was 

 up a long ascent of the mountain Lipowaia. At a considerable hill 

 called Silitour, just outside of the town, our examination was made 

 of a contact between diabase and the lowest member of the middle 

 Devonic limestone, where M. Tschernischew maintains there is 

 alteration at only one of the two contact planes. 



The ascent of the water-divide of the Oural, was accomplished in 

 the train by crossing the Tessma and turning south, where a series 

 of iron ore mines lying between the metamorphic rocks and the 

 dolomitic limestones is passed. The mines are mostly abandoned. 

 The limestones cover stratified deposits of hematite. The rocks are 

 much dislocated, but maintain a general direction of N. 30° E. The 

 dolomitic limestones correspond to limestones D\ c of the upper part 

 of the Bielaia and the mines of Bakal. On the east of the railroad 

 the mica schists are cut by granites. In the two great zigzags made 

 by the railroad in mounting the height, it traverses a development 

 of garnet rocks analogous to those seen at Slatooust (Kossotour and 

 Ourenga). 



About 3 wersts from Ourjum station, which is almost on the 

 divide, in the rocky crest of Alexandrovskaia Sopka, composed of 

 the same quartzites, as those of the Bolchoi-Taganai, the highly 

 inclined beds dip toward the European side of the Ourals. The 

 Asiatic side is covered with detritus and blocks. 



We have now arrived at the divide and seen all the rocky series 

 which are displayed on its west side. These series starting from 



