Neogene

Paleogene

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

Mesoproterozoic

Paleoproterozoic

Main source = Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian) Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

Sandzhar Formation

Sandzhar Fm

Period:

Triassic

Age Interval:

Rhaetian, B1, B1a

Province:
Bukhara-SW Gissar

Type Locality and Naming

Along the S. Sandjar in the Baysun Mountains, Southwestern Gissar. T.A. Sixtel, 1960 (409, p.39). Previously identified as the Kayrak Fm (91; 165; 339; 382, table 13; 446; 448).

Synonym: Sandzhar Suite, Санджарская св, Sandjar Fm

Lithology and Thickness

Breccias, breccia-like conglomerates, gravellites, sandstones, in which quartz composition predominates, bauxite-like rocks, argillites, siltstone (aleurolites), coals. Thickness up to 70m.

Lithology Pattern:

Aus Conglomerate

Relationships and Distribution

Lower contact

Lies transgressively on the Paleozoic

Upper contact

It is also overlain by the Gurud Fm, Baysun-Jur Fm, or Tupolang Fm.

Regional extent

Southwestern Gissar, its southern slope, Mechetli and Bukhara-Karshinsky region. The facial (invalid) analogue is the Tashkent Fm.

GeoJSON

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Fossils

Contains large plant remains - Clathropteris obovata Oishi, Plebopteris torosa Sixt. and others (383, table 4, p.1).

Age

Conditionally attributed to the Rhaetian - Lower Jurassic based on the complex of early Jurassic large plant remains and the presence of bauxite-like rocks. A. dated the suite to the Late Triassic based on large plant remains.

Age Span:

Beginning stage:

Rhaetian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

205.74

Ending stage:

Toarcian

Fraction up in the ending stage:

1.0

Ending date (Ma):

174.70

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)”