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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Sedex Formation

Sedex Fm

Period:

Jurassic

Age Interval:

Pliensbachian – Aalenian (J1-a), M3a

Province:
SE Tajik (SE Pamir)

Type Locality and Naming

It is found in Jurassic sections of the SE Murghab district Gurdumdin type in the South-Eastern Pamir.

Synonym: Sedex suite, седекская свитa

Reference section:

Lithology and Thickness

It is composed of dark, clear-bedded, cleaved clayey limestones and marls with a thickness of 100-430 m.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

The deposits conformably overlie the Gurtang-Sinemurian Gurumdin Fm

Upper contact

It is conformably overlain by the lower Bajocian Kokebelles Fm (кокбелесской свитой).

Regional extent

They are found in Jurassic sections of the Gurdumdin type in the South-Eastern Pamir, represented by the Sedex Fm (Dronov, 1958).

GeoJSON

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Fossils

The Sedex Fm contains remains of ammonites of the Lower Bajocian-Aalenian: Epideroceras ex gr. roberti Hauer (Lorraine), Arieticeras cf. algovianum Opp. (Pliensbach), Porpoceras cf. subarmatum Janng et Bird, Harpoceras falcifer Sow., Dactilioceras cf. anguinum Buckm. (roap), Dumortieria explanata Buckm., Hammatoceras cf. sieboldi Opp., H. cf. Pugnax Vacek., Ludwigella ex gr. rugosa Buckm., Fontanessia curvata Buckm. (Allen). In the very top of the suite, Eudmetoceras cf. eudmetum Buckm. have been found, characterizing the lower Bajocian.

Age

Pliensbachian – Aalenian

Age Span:

Beginning stage:

Pliensbachian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

192.90

Ending stage:

Aalenian

Fraction up in the ending stage:

1.0

Ending date (Ma):

170.90

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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