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

Modun Formation

Modun Fm

Period:

Cretaceous

Age Interval:

late Turonian, B1a

Province:
Bukhara-SW Gissar

Type Locality and Naming

By the Modun River, Southwest Gissar. M.R. Jalilov, 1968 (190, p. 43). Stratotype in the Modun River valley in the Akbrat depression.

Synonym: Modun Suite, Модунская св.

Lithology and Thickness

Gray and greenish-gray clays with layers of shell limestones containing numerous Liostrea rouvillei Coq. Thickness 40-75m.

Lithology Pattern:

Shallow-marine marl

Relationships and Distribution

Lower contact

It lies conformably on the Muzrabrat Fm

Upper contact

It is conformably overlain by the Akrabat Fm.

Regional extent

Southwest Gissar, Babatag range. It corresponds to the Pachkamar Fm and lower part of the Akrabrat Fm. X.X. Mirkamalova. (51; 56; 189; 300; 452).

GeoJSON

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Fossils

Contains ammonites - Proplacenticeras orbignyanum Gein., Pr. proplanum Iljin, Placenticeras akrabatense Vinok., Houcrquia (?) akrabatense Iljin, Lewesiceras ex gr. peramplum Mant., Coilopoceras gissarensis Iljin; marine bivalves - Inoceramus lamarckii Park., Lioltrea rouvillei Coq., L. oxiana Rom., L. gauthieri Thomas et Peron; gastropods - Ascensovoluta angusta Pčel., A. fenestrata Dzhal; sea urchins Hemiaster fourneli Desh., H. simakovi Schmidt; foraminifera - Ammomarginuline aulatensis Arap., A. sixtelae Arap., Gaudryina variabiliformis N. Byk., Gavelinella moniliformis (Reuss.).

Age

It belongs to the upper Turonian; Along A., the Resolution ... ..., 1977 (383) and in the Strat. vol. (446) - to the Coniacian. It is part of the Modun horizon.

Age Span:

Beginning stage:

Turonian

Fraction up in beginning stage:

0.7

Beginning date (Ma):

90.74

Ending stage:

Turonian

Fraction up in the ending stage:

1.0

Ending date (Ma):

89.39

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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