Akbulak-Ord Fm
Type Locality and Naming
Along the Akbulaksai River, Malyuzar Mountains. M.P. Pulatov, I.N. Elizov in 1970-1972 in the volume of the conditional upper Cambrian (72, p.79).
Synonym: Akbulakskaya Svita, Акбулакская св.
Lithology and Thickness
At the base of the section are argillaceous shales, carbonaceous shales, and carbonaceous-siliceous gray and dark-gray shales with interlayers and lenses of platy limestones, siltstones, and more rarely sandstones. Thickness: 80 m.
The upper part consists of gray and light-gray thin-bedded shales interbedded with platy siliceous shales of greenish-gray color. Thickness: 20 m.
Relationships and Distribution
Lower contact
Contacts are tectonic.
Upper contact
Contacts are tectonic.
Regional extent
Malgyzhar Mountains, headwaters of the Khojamushkent, Akbulaksay, and Taubulaksay rivers, within tectonic blocks. It is an analog of the Dzhalatar Fm of the North Nuratau Range.
GeoJSON
Fossils
At the base – Contains conodonts of the Early–Middle Ordovician — Drepanodus proteus Lind., D. Flabellum Knüp., D. altipes Henn., and others.
The upper part – They contain conodonts of the Middle Ordovician — Cordylodus ramosus Hadd., Acontiodus cooperi Sweet and Berg., Scolopodus insculptus (Branson and Mehl), and others.
Age
Depositional setting
Additional Information