Bostau Fm
Type Locality and Naming
Along Mount Boztau, Bukantau, Central Kyzylkumy. Ya.B. Aysanov et al. (1984) under the name "Bostauskaya Suite"
Synonym: Bostauskaya Suite, Бостауская св.
Lithology and Thickness
In the Upper part (Thickness about 100 m) predominate polymictic conglomerates and gravelites, including small (0.3 to 0.5 m) and large (up to 7 m) rootless boulders of light gray, gray, and dark gray limestones with Upper Bashkirian microfauna, identical to that developed in the nearby carbonate ridge. In the region of the Okzhetpes Mountains, the upper part of the section is represented by a package (thickness 140m) of sandstones, siltstones (aleurolites), and claystonse (argillites).
In the Lower part of the suite (thickness 150m) - black and dark gray claystones (argillites), interbedded with gray, brownish-gray thinly horizontal and cross-bedded siltstone (aleurolites), less frequently polymictic sandstones and gravelites.
Thickness of the entire suite 250m.
Relationships and Distribution
Lower contact
Contacts are tectonic. Schematic stratigraphic column indicates the lower contact as Akoy Fm
Upper contact
Contacts are tectonic. Schematic stratigraphic column indicates the upper contact as Keriz Fm
Regional extent
Central Kyzylkumy, Bukantau, in the form of separate areas and narrow strips along the northern slope of the Bukantau carbonate ridge, northern slope of Kokpatas, northwestern Mount Boztau, surrounds the carbonate formations of the Okzhetpes Mountains. Along Ya.B. Aysanov et al., the most complete section is traced in the regions of the Baymen and Okzhetpes Mountains.
GeoJSON
Fossils
Foraminifers in the limestone boulders (Aysanov et al., 1984; 460).
Age
Depositional setting
Additional Information