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

Tashkutan Formation

Tashkutan Fm

Period:

Triassic, Jurassic

Age Interval:

late Triassic - early Jurassic, B2

Province:
Bukhara-SW Gissar

Type Locality and Naming

Along the Tashkutan area, southern slope of the Gissar Range, Tajikistan. S.I. Levitsky, 1937 (164, p.214). Stratotype on the right bank of the Suffinka River, above the confluence with the Zacha River.

Synonym: Tashkutan Suite, Ташкурганская св.

Lithology and Thickness

Lenticular alternation of sandstones and gravels with layers and lenses of carbonaceous rocks and coals. At the base, sometimes clayey red-colored products of reworking of weathering crust. Thickness 0-70m.

Lithology Pattern:

Coarse-grained sandstone

Relationships and Distribution

Lower contact

Transgressively overlies the Paleozoic

Upper contact

It is also overlain by the Gurud Fm.

Regional extent

Southern slope of the Gissar Range. From the Luchob River to the east, to the Tashkutan area to the west (discontinuous). The presence of carbonaceous layers and bauxite-like rocks (a characteristic feature of the Sandzhar Fm) in one section allows considering the Tashkutan Fm as invalid and distinguishing only its facies analogue - the Sandzhar Fm.

GeoJSON

null

Fossils

Contains large remains of plants - Clathropteris obovata Oishi, Thaumatopteris Gissarica Brick, Phlebopteris cf. polypodioides Brongn

Age

T.A. Sistel (446) dated by large plant remains; at the Samarkand Conference 1977 (383, table 4) dated the suite as late Triassic - early Jurassic.

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)”