Karamazar-Dev Formation

Karamazar-Dev Fm

Period:

Devonian

Age Interval:

Upper Devonian Frasnian, CK9c

Province:
Chatkal-Kuramin Region

Type Locality and Naming

In the Karamazar and Kuramin mountains O.I. Sergunykova in 1959 (457, p. 85). Earlier (457) the K. suite was distinguished by O.I. Sergunykova under the name of atrypa layers of the Frasnian stage

Synonym: Karamazar Suite, Карамазарская св.

Lithology and Thickness

Limestones are gray and dark gray, sometimes red and pink, thin-bedded, cryptocrystalline and fine-grained, as well as dark gray dolomites, sometimes strongly ferruginous, thin-bedded, less often marls. In the Mogoltau mountains, the suite includes gray clayey nodular limestones. Thickness 400-600 m.

Lithology Pattern:

Dolomitic limestone

Relationships and Distribution

Lower contact

Along the bedding, it lies on the Mogotau Fm

Upper contact

Without visible unconformity, it is overlain by the Dzharbulak Fm

Regional extent

Kuramin ridge, Mogoltau and Baraktyntau mountains.

GeoJSON

null

Fossils

The lower part of the suite, due to the presence of corals - Thamnopora cervicornis Blainv.; brachiopods Undispirifer undiferus Roem. and Strinogocephalus sp.; the upper part with stromatoporoids - Clathrodictyon">Clathrodictyon tschussovense Yavor. and brachiopods Spinatrypa bifidaeformis Tschern.

Age

The lower part of the suite, due to the presence of corals was considered Frasnian; upper part possibly lower Frasnian. In the Stratigraphic Lexicon (441) and on the State Geological Map-500 of Uzbekistan (460), it is referred to the Frasnian stage.

Age Span:

Beginning stage:

Frasnian

Fraction up in beginning stage:

0.2

Beginning date (Ma):

377.34

Ending stage:

Frasnian

Fraction up in the ending stage:

0.4

Ending date (Ma):

375.78

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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