Arg Gr

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

Arg Gr

Period:

Silurian, Devonian

Age Interval:

upper Wenlock of the lower Silurian - upper Silurian Pridoli and lower Lochkovian stage of the lower Devonian, Z1

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Along the Arg River, Zarafshan-Gissar mountain region.

O.I. Nikiforova (330, pp. 5-20) under the name Arg suite; A.E. Dovzhikov, V.R. Martyshev et al. (467, pp. 33-35) raised to the rank of suite. A.I. Kim et al. (227, p. 55) raised to the rank of series. Stratotype in the middle course of the Arg. River.

Synonym: Arg Series, Арская сер., Argian Gr

Lithology and Thickness

A.I. Lavrushevich (263, pp. 20-21) subdivided into Kuturak Fm, Kupruk Fm, and Khavzak Fm. V.R. Martyshev (290) divided it into two sub-suites: Lower - amphiporoid limestones and Upper - foliophyllid and brachiopod limestones. The series is composed of dolomites and dolomitic limestones with a total thickness of 1000-1200 m.

Lithology Pattern:

Dolomitic limestone

Relationships and Distribution

Lower contact

In the stratotype, it conformably overlies the Shing Fm

Upper contact

It is conformably overlain by the Madmon Fm and Akbasay Fm.

Regional extent

Zarafshan-Gissar region.

GeoJSON

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Fossils

The lower part contains numerous amphiporoids - *Amphipora antiqua* Grin., *Clathrodictyon">Clathrodictyon numerosum* Grin.; corals - *Favosites koreanicus* Rukh., *Holmophyllum squamosum* Lavr., and in the upper part - *Tryplasma asiatica* Nikol., *Chavsakia chavsakiensis* Lavr., *Favosites fungites* Sok., *F. ramiferus* Chekh., *F. effusus* Klaam., *Atrypoidea nassa* Nikif., *A. caudata* Nikif., *A. alexandrina* Nikif., *Gissarina argensis* Nikif., *Alascospira cf. dunbari* Kirk., and others, ostracods - *Nezamyslia distributa* Mikh., *Sulcatiella plana* Mikh., *Cavelina? idonea* Abushik, *Longiscula athletica* Mikh., and others; conodonts - *Ozarcodina crispa* Wall., and others

Age

Fossil data characterizes the age range of the series in the interval of upper Wenlock of the lower Silurian - upper Silurian Pridoli and lower Lochkovian stage of the lower Devonian. In the Strat. sl. (441), the age is early Silurian (late Wenlock) - early Devonian; on the State Geol. Map-500 of Uzbekistan (460) - Silurian within the late Wenlock-Pridoli.

Age Span:

Beginning stage:

Homerian

Fraction up in beginning stage:

0.75

Beginning date (Ma):

427.71

Ending stage:

Lochkovian

Fraction up in the ending stage:

0.5

Ending date (Ma):

415.70

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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