Bogustan Formation

Bogustan Fm

Period:

Neogene

Age Interval:

Middle-Upper Miocene, CK11

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Along the village of Bogustan, Prishchekent district. F. P. Korsakov, 1965 (240, p.88). Forms the upper part of the Chirchik Gr (Middle-Upper Miocene). The term is used in a limited sense.

Synonym: Bogustanskaya Suite, Богуcтанская св.

Lithology and Thickness

Red-brown clays, siltstone (aleurolites), sandstones, and conglomerates. Thickness up to 500m.

Lithology Pattern:

Claystone

Relationships and Distribution

Lower contact

Lies conformably on the Chatkal Fm

Upper contact

Locally conformably or with erosion overlies the Beldersay Fm.

Regional extent

Prishchekent district. According to B.I. Pinhasov, the Bogustan Fm is a constituent part of the Upper Pliocene-Pleistocene brown-colored molasse formation of the Upper Tien Shan series (Upper TienShan Gr) and is correlated with the middle part of the Late Pliocene Gidzhal Fm.

GeoJSON

null

Fossils

Age

According to F.P. Korsakov (166) it is conditionally attributed to the Upper Miocene.

Age Span:

Beginning stage:

Tortonian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

11.63

Ending stage:

Tortonian

Fraction up in the ending stage:

1.0

Ending date (Ma):

7.25

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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