The present article describes four species of the genus Buxtonia (three of them newly established), originating from the Lower Carboniferous of the Alapaevsky region of the eastern slope of the Urals (collection of L. S. Librovich, supplemented by the author's collections).

The deposit lies among dislocated and metamorphosed sedimentary-volcanogenic rocks of Paleozoic age (Valerian Formation), which have a monoclinal bedding with a westward dip at an angle of 40-45°. The deposit consists of three stratum-shaped ore bodies occurring in accordance with volcanogenic-sedimentary rocks: Western, Eastern and Southeastern. The age of the ore-bearing strata of the Sarbaiskoye deposit has so far been determined by foraminifera from the core of the well located near the Western ore body (middle-upper Visenian to Lower Namur). Our faunal discovery belongs to the tuffite horizon composing the hanging wall of the Eastern ore body ...

The material for the present article is several forms of spiriferides from the collections of L. S. Librovich. The collection was assembled in 1920-1924 from a section of Lower Carboniferous sediments (Upper and Lower Namur) along the Rezh River from the village of Lugovoy to the village of Mironovo (Alapaevsky District, Sverdlovsk Oblast, on the eastern slope of the Middle Urals). The specimens collected by the author of this paper and the material delivered by A. A. Pronin were studied from the same section. Representatives of three subgenera of the genus Spirifer are described here: Spirifer, Brachythyris, and Choristites. These forms belong to the subgenera of ribbed spiriferids, a very variable group of brachiopods, which is very important in biostratigraphic respect. A representative of the subgenus Choristites is described among them. The very fact of finding Choristites in the upper Lower Carboniferous sediments is interesting for illuminating the question of the origin of the subgenus Choristites, so characteristic of the Middle Carboniferous sediments.