Dzhilginsay Fm
Type Locality and Naming
Along the Dzhilginsay River, western part of the Karachatyr Range, South Fergana. F.R. Bensh, 1959 (382, p. 77). Stratotype on the left bank of the Dzhilginsay River, Aktau Mountains, its southern and northern slopes, Kyrgyzstan.
Synonym: Dzhilginsayskaya Suite, Джилгинсайская св., Dzhingilsai suite
Lithology and Thickness
At the base of the suite (thickness. 125-155m) thick-bedded sandstones with interlayers and lenses of gravelites and small-pebble conglomerates, above - interbedding of sandstones and siltstone (aleurolites), then silty claystones with interlayers of clays, lenses, and concretions of marls and limestones. In the middle part (thickness. 25m and more) - massive biogenic and biomorphic limestones. At the top (thickness. 160-200m) – Silty claystones with interlayers and packets of thin-bedded clayey, algal, pelitomorphic, and detrital, sometimes silicified limestones. The limestones of the middle part of the section in the northern (Tuymuyun Mountains) and northwestern (Kurtash Ridge) directions significantly increase in thickness and displace the overlying siltstone (aleurolites). Thickness of this suite is 310-370m.
Relationships and Distribution
Lower contact
It lies conformably on the Akterek Fm
Upper contact
It is conformably or slightly eroded overlain by the Uchbulak Fm
Regional extent
South Fergana, Karachatyr Range. At the top, along the foraminiferal complex, it corresponds to the zone of Protriticites pseudomontiparus - Obsoletes obsoletus.
GeoJSON
Fossils
In the middle part - various organic remains (foraminifera, corals, crinoids, pharetron sponges, brachiopods, algae). At the top, contains foraminifera - Protriticites pseudomontiparus Putrja, P. globulus turkestanicus Bensh, P. variabilis Bensh, Obsoletes obsoletus (Schel.), O. Vetus Rjas., Pseudotriticites donbassicus asiaticus (Bensh), Quasifusulinoides juvenatus Kir. and others.
Age
Depositional setting
Additional Information