Karashor Formation

Karashor Fm

Period:

Paleogene

Age Interval:

Lower-Middle Eocene, U2

Province:
Ustyurt-Sultanuzdag

Type Locality and Naming

By the estuary of Karashor, North Turkmenistan. E.I. Saperson, A.A. Zheleznov, 1962 (404, p. 894).

Synonym: Karashorskaya Suite, Карашорская св.

Lithology and Thickness

Clayey limestones, white, greenish-gray, gray marls, greenish-gray. Thickness up to 36 m.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

Conformably overlies the Kyzyltakyr Fm

Upper contact

Conformably overlain by the Ilyalin Fm

Regional extent

South Pre-Aral, East Ustyurt. Exposed by drilling. It is correlated with the lower part of the Sugraly Fm of the Kyzylkum Desert.

GeoJSON

null

Fossils

Contains foraminifers of the Globorotalia aragonensis (Nutt) zone, Acarinina bulbrooki (Bolli); ostracods - Cytherella urea Mand., Limburginatetis Mand., Sigillium ellipsoidale Ros., Paijenborchella villosa Mand., Echinocythereis aragonensis Oertli., Oceultocythereis picturata Sak., Trachyleberis spiniferrima (Jones et Sherborn), Cytheropteron consimilis Sak., and nanoplankton of the NP 12-14 zone - Marthasterites tribrachiatus, Discoaster lodoensis, D. sublodoensis.

Age

Lower-Middle Eocene. The lower part, containing *Globorotalia aragonensis*, is assigned to the Lower Eocene, while the upper part—containing *Acarinina bullbrooki*—is assigned to the Middle Eocene. In the Stratigraphic Lexicon (444), it is assigned to the Eocene.

Age Span:

Beginning stage:

Ypresian

Fraction up in beginning stage:

0.5

Beginning date (Ma):

52.04

Ending stage:

Lutetian

Fraction up in the ending stage:

0.5

Ending date (Ma):

44.55

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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