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

Guzhum-Tyubegatan Formation

Guzhum-Tyubegatan Fm

Period:

Jurassic

Age Interval:

Late Oxfordian-early Kimmeridgian, B1

Province:
Bukhara-SW Gissar

Type Locality and Naming

In the village of Gujum in the Tubegatan Mountains, South-Western Gissar. V.V. Kurbatov, E.A. Repman, 1982 (253, p.43). Stratotype in the Gaurdak section (Beshbulak). Identified by V.V. Kurbatov in 1978 (60) as Tubegatan layers, and in 1983 - as Tubegatan suite. (59), which turned out to be invalid. M.E. Egamberdyev et al. in 1980 (513) called the G.-t. Fm as Hodzhaypak p., and X.X. Mirkamalov et al. in 1985 (48) - Hodzhaypak Fm ( Khodzhaipak Fm ). Oil producers call it Black Slate or high-gamma p. In the monograph (165) instead of G.-t. mistakenly printed Gujum sv. Upper formation in Kugitang Gr in SW Gissar

Synonym: Gujum - Tubegatan Suite, Gujum-Tybegatan Fm, Khodzhaipak Fm, Khojaikan Suite, Гуджум-тюбегатанская св., Ходжаипакская св.

Lithology and Thickness

Black bituminous marls, limestones, siltstone (aleurolites). Thickness 5-40m

Lithology Pattern:

Shallow-marine marl

Relationships and Distribution

Lower contact

The formation along the bedding lies on the Zakharlin Fm

Upper contact

with erosion is covered by sv. n. anhydrites.

Regional extent

Tubegatan, Gaurdak, Bukhara-Karshinsky district. Laterally replaced by the Zakharlin Fm in the direction opposite to the coastline, and in the direction towards the coast - by the Kurek Fm.

GeoJSON

null

Fossils

Contains ammonites - Othetoceras sp., Lithacoceras sp., Ataxioceras sp.; layers with marine bivalve mollusks - Parallelodon lutugini - Parallelodon gissarensis; foraminifera - Lenticulina münsteri (Roemer), Epistomina parastelligera (Hofker); fish - Pholidoporinae; radiolarians (381; 462).

Age

Age determined by late Oxfordian early Kimmeridgian.

Age Span:

Beginning stage:

Oxfordian

Fraction up in beginning stage:

0.7

Beginning date (Ma):

156.81

Ending stage:

Kimmeridgian

Fraction up in the ending stage:

0.25

Ending date (Ma):

153.40

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)”