Umbetin Formation

Umbetin Fm

Period:

Devonian

Age Interval:

Frasnian, CK9c

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Named after the Umbety River, Kuramin ridge. O.I. Sergunykova, 1965 (457, p. 95).

Synonym: Umbetin Suite, Умбетинская св.

Lithology and Thickness

Massive, less frequently thin-bedded and flaggy, sometimes aleuritic dolomites, clayey and aleuritic limestones, and interlayers of marls, thickness 350-437m.

Lithology Pattern:

Dolomitic limestone

Relationships and Distribution

Lower contact

It lies conformably on the Dzharbulak Fm (165; 441).

Upper contact

Schematic stratigraphic column indicates Umbetin Fm

Regional extent

Kuramin ridge, Mount Baryktyntau.

GeoJSON

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Fossils

Contains stromatoporoids Clathrocoilona kalkanensis (Ikon.), Tienodictyon tschusovense Yavor., Actinostroma">Actinostroma tabulatum crassum Less.; tabulates - Thamnopora boloniensis (Gossel.); brachiopods Cyrtospirifer markovskii Nal., Unhtospirifer murchisonianus (Nal.), Theodossia ex gr. anosofi Vern., Productus lachrimosus Conr. and others, conodonts - Polygnathus webbi Stauff., P brevis Mill et Young., Klapporina disparilis Ziegl. et Klapp

Age

Fossil data characterizes the Frasnian age

Age Span:

Beginning stage:

Frasnian

Fraction up in beginning stage:

0.6

Beginning date (Ma):

374.22

Ending stage:

Frasnian

Fraction up in the ending stage:

0.8

Ending date (Ma):

372.66

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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