Russia, Magadan region, creek watershed Assault (Shturmovoy) and Chess (Shakhmatnyy). Siltstones with interbeds of sandstones with quartz veins, lenses. Quartz contains gold mineralization. Susumanskaya series. Fossil: Inoceramus sp. indet., I. ex gr. porrectus Eichw. Middle Jurassic.
