Russia, Subpolar Ural, Lemva river valley. Dark gray, massive limestones interbedded with dark gray shales. In limestones, scattered detritus of crinoids, broken shells and corals in the form of lenticular jets is often present. Limestones are relatively pure pelitomorphic, often silicified. Fossil: Trupestroma porosum Lec., Dendrostella cf. trigemme Guenst., Cupressocrinites cf. gracilis Goldf., Polygnathus ex gr., xylus Zieg., Po. costatus costatus Klapp., Po. cf. timorensis Klapp. Nadotamyl'kskaya series. Middle Devonian.