Shayandin Formation

Shayandin Fm

Period:

Devonian, Carboniferous

Age Interval:

, K5a

Province:
Kyzylkum Region

Type Locality and Naming

By the Shayan, S. Tamdytau, Central Kyzylkum. Z.M.Abdazimova et al., 1992 (10, pp. 4-5).

Synonym: Shayandin Series, Шаяндинская св.

Lithology and Thickness

Clayey-siliceous slates with horizons of flaggy cherts, interlayers of limestones and aleuropelites. Thickness 65-80m.

This suite was assigned by I.M. Nigmadzhanov to the carbonate-siliceous deposits of the Darbazatau and Sangruntau mountains, Thickness 150-300m.

Lithology Pattern:

Pelagic marl

Relationships and Distribution

Lower contact

Lower contact unknown

Upper contact

Overlain with deep erosion by the Murynkuduk Fm.

Regional extent

Central Kyzylkum, north Tamdytau, basin of the Azhrikti, Dzhamankyngyr rivers, Kynkyr area, Shayan city, along the northern foothills of the Muruntay ridge, Murynduk area. Stratotype in the Shayan area.

GeoJSON

null

Fossils

Contains conodonts - Gnathodus bilineatus bilineatus Round., Palmatolepis perlobata schindewolfi Mill, P. glabra pectinata Zieg, P. minuta minuta Br. et M., Palmatodella delicatula Stauff., P. perlobata perlobata Ulr. et Barr. and others of the Middle Devonian-Lower Carboniferous; foraminifers - Archaesphaera minima Sul., Parathurammina paulis Byk.

This suite was assigned by I.M. Nigmadzhanov containing Late Devonian-Early Carboniferous (Tournaisian) conodonts - Gnathodus delicatus Br. et Mehl., Palmatodolla fragosa Br. and others; radiolarians - Umtactinosphaera aff. grandis Naz.

Age

Late Devonian-Early Carboniferous.

Age Span:

Beginning stage:

Frasnian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

378.90

Ending stage:

Visean

Fraction up in the ending stage:

0.5

Ending date (Ma):

338.54

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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