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Quaternary mollusks from deposits of the 2nd terrace of the Ischora River



Quaternary mollusks from deposits of the 2nd terrace of the Ischora River



Bulletin Comite Geol 44(4): 439-478



[1926].[long dash]Eighteen species of land shells, 22 of freshwater snails and 1 Lamellibranch (Pisidium fontinale Pfeif.) are determined from extensive collections from the 2nd terrace (Post Tertiary) of the Ischora River. Most of the species are figured and the number of individuals is given but no new names are proposed. Vallonia tenuilabris Braun, Vertigo alpestris Alder, Gyraulus gredleri Bielz, Hippeutis riparius Westerl and Valvata cristata palustris(?) Kormos are no longer living in this region (Gov. Leningrad). A special study is made of the last named form, in which 4 groups are recognized which form a natural series with Valvata cristata Mul. The fauna is a mixture: 2 arctic species, Vallonia tenuilabris and Vertigo alpestris; 3 suggesting a cold climate, Patula ruderata Studer, Succinea putris L., S. pfeifferi Rossm.; and 3 indicating a warm climate, Vertigo antivertigo Drap., V. angustior Jef., and Limnophysa palustris turricula Held. However, the abundance of Bilthynia tentaculata L. (257 specimens) and Planorbis planorbis L. (35 specimens) suggests Menzel's 2nd stage of Post-Glacial time.

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