Shordzhin Formation

Shordzhin Fm

Period:

Jurassic

Age Interval:

Middle - Upper Jurassic, U3

Province:
Ustyurt-Sultanuzdag

Type Locality and Naming

Along the Shordji area on the Ustyurt. A.M. Akramkhodzhaev et al., 1970 (46, p.31). It is distinguished as the Shordzhin rhythmic Fm and corresponds to the II and III productive horizons (Urchin Horizon).

Synonym: Shordzhin Suite, Шорджинская св.

Lithology and Thickness

Clays, which in the lower part are greenish-gray (p. I), in the upper part - brownish-red (p. II). Thickness 80-530m.

Lithology Pattern:

Claystone

Relationships and Distribution

Lower contact

It lies with erosion on the Kafaklin Fm

Upper contact

It is overlain with erosion by the Shakhpakhtin Fm or Aibugir Fm.

Regional extent

It is attributed to the Kugitang Horizon (252).

GeoJSON

null

Fossils

Contains a complex of spores and pollen - Cyathidites minor Couper (3-17), C. junctus (K.-M.) Alimov. (0.5-3), Concavisporis totalis (Leschik) Nelsson (0.5-2), Motonisporites sp. (1), Lygodiumisporites areenois Pot. et Gell. (0.5), Todisporites granulatus Tralay (0.5), Osmundacidites kugartensis Kuz. (0.5), Taurocusporites reduncus (Bolch.) Stover. (0.5), Circellina bicycla Mal. (0.5), Classopollis sp. (35-100)

Age

Complex of spores and pollen do not contradict the Callovian - Oxfordian age of the suite. Base-Callovian "TO FIT" in Lexicon

Age Span:

Beginning stage:

Callovian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

165.29

Ending stage:

Callovian

Fraction up in the ending stage:

0.7

Ending date (Ma):

162.66

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)”