Seslavin Formation

Seslavin Fm

Period:

Carboniferous

Age Interval:

Bashkirian, CK3

Province:
Chatkal-Kuramin Region

Type Locality and Naming

By the village of Seslavino (now Duababa), Daunytau city, Talassky Alatau range. O.I. Sergun'kova in the In the early 1930s (382, pp. 62–63).

Synonym: Seslevinian Suite, Сеславинская св.

Lithology and Thickness

Organogenic-detrital, nodular-detrital, organogenic limestones with rare nodules and lenses of flint, interlayers of clayey, sandy, dolomitized limestones. Thickness from 70 to 500 m.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Conformably overlies the Koykebiltau Fm

Upper contact

Conformably overlain by the Yakhak Fm or Surkhat Fm

Regional extent

Western part of the Talassky Alatau, Ugamsky, and Pskemsky ranges. I.M. Nigmadzhanov includes the Seslavin Fm in the upper part of the Naualin Fm (460).

GeoJSON

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Fossils

Contains brachiopods Schellwienella crenistria Phill., Linoproductus corrugatus M'Coy, Spirifer bisulcatus Sow., Productus consiniformis Tul., Choristites bisulcatiformis Semich.; foraminifers - Eostaffella (Plectostaffella) talassica (Rum.), E. (P.) evolutica (Rum.), Asteroarchaediscus subbaschkiricus Reitl., A. baschkiricus (Krest. et Theod.) and others

Age

Fossil data indicates the early Bashkirian age of the enclosing rocks.

Age Span:

Beginning stage:

Bashkirian

Fraction up in beginning stage:

0.2

Beginning date (Ma):

321.75

Ending stage:

Bashkirian

Fraction up in the ending stage:

0.3

Ending date (Ma):

320.93

Depositional setting

Depositional pattern:

Additional Information

Compiler:

B.B. Muxaŭlov – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”