Lacustrine (lake) shales of the Yixian Formation (near-lowermost Cretaceous). The Jehol Group of western Liaoning Province, northeastern China has produced numerous remarkable fossils, particularly feathered dinosaurs. Shown below is one of the most abundant fossil forms in the Jehol Group - this is Lycoptera davidi. Lower Creaceous, Aptian-Barremian.
The location of the find is indicated very approximately. If you can specify more precisely, I would be extremely grateful.
Russia, Khabarovsk Territory, small Khekhtsir range. Dark gray siltstones with interlayers (up to 10 cm thick) of greenish-gray fine-grained polymictic sandstones. Pionerskaya series. Thickness - 500 metres. Lower Cretaceous. Valanginian.
Russia, Khabarovsk Territory, Big Khekhtsir range. Dark gray siltstones with interlayers (up to 10 cm thick) of greenish-gray fine-grained polymictic sandstones. Pionerskaya series. Thickness - 500 metres. Accurate dating of age - no. Fossil - yes (in another area).
Russia, Khabarovsk Territory, Khabarovsk. Siliceous-clay schists with lenses of gray limestone and quartz veins. Fossil: Neoschwagerina margaritae (Dep.), Pseudodoliolina aff. ozawai Yabe et Hanz, Codonofusiella, Neofusulinella, Reichelina, Pseudofusulina kraffti (Shellw.-Dyhrenf.), P. aff vulgarus (Shellw.-Dyhrenf.). At the bottom of the first photo are diabase porphyrites. Permian? Khabarovskaya series. Thickness 2150 metres.
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.
