Bozdon Formation

Bozdon Fm

Period:

Carboniferous

Age Interval:

Lower Moscovian, K4

Province:
Kyzylkum Region

Type Locality and Naming

Along the Buzdon Ridge, Tamdytau Mountains, Central Kyzylkum. 3.S.Rumyantseva, 1959 (382, p.74); 1965 (457, p.345); 1974 (386, p.21). Stratotype 2 km north of the 3rd Belkuduk column, at the eastern end of the Buzdon Ridge, Muruntau Mountains.

Synonym: Bozdonskaya Suite, Боздонская св.

Lithology and Thickness

Light gray and gray fine- and medium-bedded algae-foraminiferal, detrital, crinoidal, organogenic-clastic limestones. In Aktau, strongly altered with recrystallized organic remains. Thickness up to 150 m.

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

It is located in a continuous section with underlying deposits of the base of the Lower Moscovian Substage (Aljutovella aljutovica Zone) of the Kokchin Fm

Upper contact

It is overlying Azhriktin Fm (Ajhrikhtin Fm).

Regional extent

Central Kyzylkum, Tamdytau Mountains, Muruntau, and Aktau. Corresponds to the upper part of the Severomuruntau Fm.

GeoJSON

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Fossils

Contains a complex of foraminifers of the Lower Moscovian Zone Aljutovella priscoidea - Eostaffella mutabilis Raus., Neostaffella subquadrata (Gr. et Leb.), N. umbilicata (Putrja), Ozawainella mosquensis Raus., Profusulinella convoluta (Lee et Chen), P. muruntavica Rum., Ovatella constans (Saf.), Depratina prisca (Depr.), D. paratimanica (Raus.), Taitzehoella prolibrovichi (Raus.), Aljutovella saratovica (Putrja et Leont.), Skelnevatella isvarica (Putrja), S. cafirniganica (Bensh), Eofusulina triangula (Raus. et Bel.), E. corpulenta Rum.; brachiopods - Choristites ex gr. mosquensis Fisch., C. cf. priscus Fisch.; among algae, representatives of the genus Beresella predominate.

Age

According to Z.S.Rumyantseva (439), it belongs to the lower part of the Kelvasay Horizon - Lower Moscovian Substage (165,439).

Age Span:

Beginning stage:

Moscovian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

315.15

Ending stage:

Moscovian

Fraction up in the ending stage:

0.2

Ending date (Ma):

313.52

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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