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Carboniferous

Devonian

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Mesoproterozoic

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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

Yatavluk Formation

Yatavluk Fm

Period:

Devonian

Age Interval:

Eifelian-Frasnian, Z1

Province:
Zarafshan-N.Gissar

Type Locality and Naming

By the Yatavlyk River, right tributary of the Aksu River, Zarafshan-Gissar mountain region, basin of the Kashkadarya River. A.I.Kim, M.V.Erina, 1984 (228, pp.25-28). Stratotype in the Yatavlyuk River.

Synonym: Yatavlukskaya Suite, Ятавлукская св., Akbasy Fm; Yatavlyk Fm, Yatavlyuk Fm

Lithology and Thickness

Lower part of the suite - siltstone-aphanitic, detrital-siltstone thin-bedded, locally stromatolitic limestones. Upper part - rhythmically alternating siltstone-aphanitic and detrital-siltstone thick-bedded and massive limestones with interlayers of clayey material and cherts. Thickness 490-620m.

Lithology Pattern:

Shallow-marine marl

Relationships and Distribution

Lower contact

Lower boundary conformable with the Raisak Fm (Raikazak Fm)

Upper contact

Upper boundary established not everywhere due to tectonics. According to I.M. Nigmadzhanov, the Yatavluk Fm conformably overlain by the Novchomok Fm.

Regional extent

Yatavlyuk River, left watershed of the Yatavlyuk River.

GeoJSON

null

Fossils

Contains stromatoporoids - Stachyodes ex gr. insignis Yavor., S. ex gr. verticillata Mc’Coy; tabulates - Alveolitella ex gr. polenovi Peetz, A. aff. fecunda Salee, Crassialveolites multiperforata Salee, Syringoporella ex gr. moravica F. Roemer, Thamnopora ex gr. absurda Yanet; rugosans - Alaiophyllum jarushevski Gor., Centristella fascicularis Tsyg., Gorizdronia breviseptata Ivania, Calceola sandalina Lam., Neostringophyllum isetense Soshk., Tamnophyllum turbinatum Hill.; brachiopods - Stringocephalus burtini Defr., Gypidula globa Schnur., Semiotoechia cf. polita Ljasch., Leiorhynchus cf. uchtensis Ljasch., Pugnax cf. jaregae Ljasch. and others, Tentaculites - Nowakia sokolovi Kim, Stiliolina sp.; conodonts Polygnathus costatus costatus Klapp., P. costatus partitus Klapp. et al, P. robusticostatus Bisch. et Ziegl., P. pseudofoliatus Witt., P. angustipennatus Bisch. et Sann., P. parawebbi Chatt., P. timorensis Klapp. et al., P. varcus Stauf., P. ansatus Ziegl. et Klapp., P. asymmetricus asymmetricus Bisch. et Ziegl., P. foliatus Bryant, P. ancyrognathoides Ziegl., Palmatolepis disparalvea Ziegl. et al., P. transtans iMüll., P. subrecta Müll. et Young., P. cf. proversa Ziegl., P. punctata Hinde, P. foliacea Young., P. hassi Müll., P. triangularis Sann., P. pooli Sand. et Ziegl., P. subperlobata Branson et Mehl,, P. rhomboidea Sann., P. tenuipunctata Sann., P. glabra pectinata Ziegl., P. minuta minuta Branson et Mehl., Ancyrodella cf. buckeynsis Stauff., A. nodosa Ulrich. et Bassler, A. gigas Young.; foraminifers - Parathurammina olgae Sul., Bisphaera irregularis Bir. and others.

Age

The age of the suite corresponds to the interval from the beginning of the Eifelian to the Famennian stage inclusive. (165). Put as mid-Eifelian (to avoid overlap) - "beginning of Eifelian through Frasnian (burt "conformably overlain by Novomok => Famennian also)

Age Span:

Beginning stage:

Eifelian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

389.80

Ending stage:

Frasnian

Fraction up in the ending stage:

1.0

Ending date (Ma):

371.10

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)”