Some spiriferids from the namurian deposits of the Eastern slope of the Urals
Abstract
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.
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