Cenozoic

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

Main source = Baratov, R.B., et al. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Publishing House "Donish", Dushanbe, 269 pp. plus tables. Provided by Dr. Jovid Aminov, Nazarbayev University, Astana, Kazakhstan Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

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Matchay Formation

Matchay Fm

Period:

Devonian, Silurian

Age Interval:

Ludlow-Lochkovian (S2-D1 mt), S3, S4, S5

Province:
North Tajik

Type Locality and Naming

The name was proposed by A. Ye. Dovzhikov et al. (1958). The names of the formation were multiple entries, hence used Matchay Fm for Lexicon format from 57 and 48 pg numbers in the extracted book.

Synonym: Matchayskaya Suite, Matchai Fm, Matchaikov Fm, Матчайская свита

Reference section:

Lithology and Thickness

Limestone. The suite is represented by layered and massive light and dark gray limestones, in which three horizons are distinguished: Dalian, Isfarinsky, and Kunjak (дальянский, исфаринский и кунжакский). These horizons within the area of development of the Matchayskaya Suite are considered as sub-suites.

The Dalian horizon is characterized by thick-bedded and massive limestones with rare packets of clayey limestones. The Isfarinsky horizon is usually composed of thin-bedded clayey limestone. The Kunjak horizon is most often represented by thin-bedded clayey and sometimes silicified limestones.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Pulkhon Fm in Ghohchi district

Upper contact

Regional extent

The suite is exposed in the limits of the Turkestan region near the village of Dalian, in the mountains of Kuh, to the east of Uratyube, and in the valley of the river Isfara. The thickness is up to 1200 m.

GeoJSON

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Fossils

In the Dalian horizon, pentamerids from the group Conchidium knighti Sow. are most common, in addition, stromatoporoids Ecclimadictyon microfastigiatum (Riab.), Clathrodictyon vesiculosum Nich. et Mur. var undulatum Grin.; tabulates Favosites similis Sok., Innapora incredula (Chernova); rugose corals Tryplasma loveni M., Edw. et H., Thecaspinellum deljanilum Lavrus. and others are present. In Isfarinsky horizon, Stromatoporoids Densastroma podolicum (Yavor.), D. astroides (Rosen'), Intexodictyon savaliense Riab.; tabulates Favosites nikiforovae Chekh., Squameofavosites ferganensis Chekh., Heliolites praeporosus Kettri; rugose corals Zelolasma praecox Hill, Strombodes sokolovi Lavrus., Yassia enormis (Ether); brachiopods Retziella weberi Nikif., Eoreticularia tschernyschevi Nal., Howellella isiarensis (Nikif.); graptolites Colonograptus extenuatus Abduas are especially characteristic for this horizon. In Kunjak horizon, Pachyfavosites kozlowskii Sow., Favosites clarus Yanet, Cladopora rectilineata Simps., Microplasma multilobatum (Spassky), Neomphyma originata Soshk, Gypidula pelagica Barr., Camarotoechia famula Barr., Monograptus hercynicus Perner, Warburgella rugulosa Alth. and others.

Age

Ludlow-Lochkovian. It is mentioned in Pulkhon Fm, that Ludlowian- Lochkovian Matchai suite

Age Span:

Beginning stage:

Gorstian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

425.87

Ending stage:

Lochkovian

Fraction up in the ending stage:

0.5

Ending date (Ma):

415.70

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Extracted from Baratov, R. B. (1976). Subdivisions of stratified and intrusive rocks of Tajikistan. Donish, Dushanbe, 276.