Russia, Khabarovsk territory, Khekhtsir range. Burgundy and gray jasper-like siliceous rocks. Voronezhskaya strata. The thickness is about 600 m with interlayers (1–2 cm) of siliceous-clayey rocks and rare lenses (10–30 m) of limestones. In limestones fossil: Halobia cf. charliana Mojs., Posidonia subwengentus Kipar., Nodosaria sub-primitiva Herke, N. cf. biloculina Fran, Arcetes. Middle and Upper Triassic.
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.
Russia, Subpolar Ural, Kozhim river valley. White, light gray marbled limestones. Include microlayers of quartz-mica composition, the content of quartz grains in them sometimes reaches 30–35%. Under the microscope of the rock, a granoblastic structure with relics of an uneven-grained - blastopsammite and blastoaleurite is found; layered, banded texture and consist of a calcite heterogeneous aggregate (70–99%) with intercalations of quartz grains (up to 25%) and microlayers of carbonaceous-chlorite-sericite, muscovite-chlorite composition.
