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

Akrabat Formation

Akrabat Fm

Period:

Cretaceous

Age Interval:

Coniacian, B1, B1a

Province:
Bukhara-SW Gissar

Type Locality and Naming

Named after the village of Akrobat, Southwest Gissar. M.R. Jalilov, 1968 (190, p.43). Stratotype at the western part of the village of Akrobat, on the left slope of the Modun River valley. Upper most formation in the Akrabat Horizon, Adamtash Gr.

Synonym: Akrabatskaya Suite, Акрабатская св., Akbrat Fm? , Acrabat Fm

Lithology and Thickness

Clays, marls light-gray with layers of shell limestones. Thickness 57-130m.

Lithology Pattern:

Shallow-marine marl

Relationships and Distribution

Lower contact

Conformably overlies the Modun Fm (Pachkamar Fm)

Upper contact

Conformably overlain by the Kattakamish Fm.

Regional extent

Southwest Gissar, Babatag Ridge. X.X. Mirkamalov et al. increase the span of the suite at the expense of the upper part of the Modun Fm (56; 190; 300; 383; 446; 452).

GeoJSON

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Fossils

Contains ammonites - Barroisiceras akrabatense Iljin, Lerursiceras asiaticum Iljin, Placenticeras orbignyanum Iljin, Pl. crassum Iljin, Proplacenticeras ex gr. proplanum Iljin, Prionocycloceras sp.; marine bivalves - Inoceramus ex gr. lamarckii Park., In. cleini Müll., In. apicalis Woods., In. zeitzi And., In. frechi And., Costeina akrabatense (Beliak.); gastropods - Nairiella roemeri Arust., Ascensovoluta angusta Pčel., A. subconstricta Pčel., A.fenestrata Dzhal.; sea urchins Echinobribsus markovi Faas, Hemiaster fourneli Desh., H. integr. Lamb., H. amudariensis Schmidt.; foraminifers - Ammomargulina sixtelae Arap., Am. aulatensis Arap., Gaudryina variabiliformis N.Byk., Gavelinella moniliformis (Reuss), G. praeinfrasantonica (Mjatl.); ostracods - Cytherella facila Mand., Bairdia derooi Andrv., Brachycytere dotata Mand., Cosfa tadjikistanica Andrv., Bythocytheremorpha porrecta Vronsk., Pajenborchella asiatica Andrv.

Age

Belongs to the Coniacian.

Age Span:

Beginning stage:

Coniacian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

89.39

Ending stage:

Coniacian

Fraction up in the ending stage:

1.0

Ending date (Ma):

85.70

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)”