Neogene

Paleogene

Cretaceous

Jurassic

Triassic

Permian

Carboniferous

Devonian

Silurian

Ordovician

Cambrian

Neoproterozoic

Mesoproterozoic

Paleoproterozoic

Main source = Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian) Translated to English by the GeoGPT group, Zhejiang Lab, Hangzhou, China--see About

Semizalpin Formation

Semizalpin Fm

Period:

Devonian, Carboniferous

Age Interval:

Famennian-Tournaisian, N3a

Province:
Nuratau

Type Locality and Naming

In the Semizsalpa coal mine, Pistalitau Mountains, northern foothills of the N. Nuratau Range. O.I. Sergun'kova, 1959 (382, table 5; 441, p. 394).

Synonym: Semizsalpinskaya Suite, Семизалпинская св.

Lithology and Thickness

Alternation of massive and thick-bedded gray and light-gray limestones. Limestones are predominantly aphantic, oolitic, pseudooolitic, and less frequently detrital. At the base of the formation, there is a package of dark-gray, thin-bedded, bituminous limestones with gastropod remains. Thickness 1400m.

Lithology Pattern:

Oolitic limestone

Relationships and Distribution

Lower contact

Stratigraphically conformable with (on) the limestones of the Kolsuyuk Fm

Upper contact

It is overlain by the Tabakbulak Fm (Cherkashenko et al., 1983).

Regional extent

Northern foothills of the northern Nuratau range, locally in the central part of the Pistalitau Mountains.

GeoJSON

null

Fossils

In the lower part of the section, Famennian foraminifers - Parathurammina cf. suleimanovi Lip., P. cf. cushmani minimaAntr., Septoglomospiranella cf. nana Reitl., Bisphaera cf. elongata Pojark. and others; brachiopods - Cyrtospirifer vernuili Murch., C. archiaci Murch.; conodonts Apatognathus varians B. et M., Polygnathus sp., Icriodes sp. of Famennian age. Higher up - early Tournaisian foraminifers - Vicinosphaera squalida Antr., Grierosphaeroicus simplexReitl. and others; brachiopods - Phytiophora temirensis (Serg.), P. temirensis f. angusta (Serg.), Schellwienella planumbona Weller. and others; conodonts - Bispathodus sp., Pseudopolygnathus cf. dentilineatus and others.

Age

V.S. Korsakov et al. (1993) and R.R. Usmanov et al. (1999) accept a late Famennian-Tournaisian age. (165; 460).

Age Span:

Beginning stage:

Famennian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

371.10

Ending stage:

Tournaisian

Fraction up in the ending stage:

0.5

Ending date (Ma):

353.02

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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