Samarkandek Formation

Samarkandek Fm

Period:

Jurassic

Age Interval:

Middle Jurassic, F9a

Province:
Fergana

Type Locality and Naming

Named after the ancient city of Samarkand. V.V. Kurbatov, E.A. Repman, M.V. Mikulin, et al., 1971 (254, p.27). Shurab coal mine, South Fergana, where the stratotype is selected.

Synonym: Samarkandek Suite, Самаркандекская св.

Lithology and Thickness

Variegated gravels, sandstones, siltstones, clays, coals. Thickness up to 350 m.

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

Conformably overlies the Sogul Fm

Upper contact

It is transgressively overlain by the Balabansay Fm

Regional extent

Shurab coal mine, South Fergana. Previously, the deposits were included in the Sulyukta Fm (339; 382, table 13; 383, table 5, p.2; 446).

GeoJSON

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Fossils

Contains large plant remains - Equisetites ferganensis Sew., Coniopteris spectabilis Brick, Nilssonia serrata Pryn., Ginkgo sibirica Heer, etc.; freshwater bivalve mollusks - Pseudocardinia asiatica Tschern., Subcardinia sibirensis Mart.

Age

Organic remains do not contradict the Middle Jurassic. But the schematic stratigraphic column indicates Middle Jurassic (Aalenian-Bathonian)

Age Span:

Beginning stage:

Aalenian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

174.70

Ending stage:

Bathonian

Fraction up in the ending stage:

0.8

Ending date (Ma):

165.87

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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