Yangak Fm
Period:
Carboniferous
Age Interval:
Middle Carboniferous (Bashkirian), F10
Province:
Fergana
Type Locality and Naming
Along the village of Yangak, S. Fergana. A.D. Miklouho-Maclay, G.S. Porshnyakov, 1961 (296, p. 13). Stratotype in the basin of the Shuransay near the village of Yangak.
Synonym: Yangakskaya Suite, Янгакская св.
Lithology and Thickness
Limestones, interbedded with clay shales. Thickness 50-70m. In the Stratigraphic Lexicon (439) indicates thickness. up to 400-450m
Lithology Pattern:
Clayey limestone
Relationships and Distribution
Lower contact
Conformably overlies the Vizebashkirian limestones
Upper contact
Conformably overlain by the Karatangin Fm
Regional extent
Southern Fergana, northern foothills of the Alai Range, interfluve of the Sokh-Shahimardan.
GeoJSON
null
Fossils
Limestones contain foraminifers Pseudostaffella antiqua (Dutk.), Eostaffella pseudostruvei Raus. et Reitl., E. parva Moell, characteristic of the early Bashkirian substage.
Age
Assigned to the Bashkirian stage of the middle Carboniferous. In the Stratigraphic Lexicon (457) assigned to the upper Bashkirian substage. In the Stratigraphic Lexicon (439) indicates thickness. up to 400-450m and age within the upper part of the early Bashkirian substage and the upper Bashkirian substage of the middle Carboniferous. On the State Geological Map-500 of Uzbekistan (460) - Bashkirian stage of the middle Carboniferous.
Age Span:
Beginning stage:
Bashkirian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
323.40
Ending stage:
Bashkirian
Fraction up in the ending stage:
1.0
Ending date (Ma):
315.15
Depositional setting
Depositional pattern:
Additional Information
Compiler:
B.B. Mikhailov – In: GeoGPT translation of: ”Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)"