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

South Sumsar Formation

South Sumsar Fm

Period:

Silurian

Age Interval:

Llandovery-Wenlock, Z1a

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Along the Sumskaya ridge, right bank of the Karasu River, basin of the Kashkadarya River, Zarafshan-Gissar mountain region. Stratotype on the Shakhriomona pass.

Synonym: South Sumskaya Suite, Южносумсарская св.

Lithology and Thickness

Gray and dark gray layered sugary dolomites, sometimes organogenic. Thickness 100-565m.

Lithology Pattern:

Dolomite

Relationships and Distribution

Lower contact

The lower and upper boundaries shift laterally, although in the stratotype, the suite is in conformable bedding with the Shakhriomon Gr

Upper contact

The lower and upper boundaries shift laterally, although in the stratotype, the suite is in conformable bedding with the Kuturak Fm.

Regional extent

North slope of the Gissar Range, western part of the Zarafshan Range.

GeoJSON

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Fossils

Contains stromatoporoids - *Ecclimadictyon fastigiatum* Nich.; tabulates - *Palaeofavosites oelaensis* Klaam., *P. forbesiformis* Sok., *Halysites aff. priscur* Klaam., *Propora aff. yabei* Ozaki, *Thecia cf. romanovskii* Lel., rugosans - *Pseudophaulactis lykophylloides* Zapr. et Ivnsk.; brachiopods - *Virgiana barrandei* Bill., *Clorinda aff. malmoeyensis* St. I., *Pentamerus oblongus* Sow., graptolites - *Ortograptus cf. sinitzini* Chal.

Age

The complex of organic remains characterizes the suite as Llandovery-Wenlock

Age Span:

Beginning stage:

Rhuddanian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

443.07

Ending stage:

Homerian

Fraction up in the ending stage:

0.75

Ending date (Ma):

427.71

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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