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

Lolabulak Formation

Lolabulak Fm

Period:

Ordovician

Age Interval:

Middle-Upper Ordovician, Z4

Province:
Zarafshan-N.Gissar

Type Locality and Naming

In the eponymous southwestern part of the Kara-Tyube Mountains, where it is most widely developed. V.S. Korsakov in 1984 (1993) distinguished it from the Sarykul suite (460, p.63).

Synonym: Lolabulak Suite, Лолабулакская св.

Lithology and Thickness

Quartz-sericite slates, siliceous siltstone (aleurolites), sandstones with interlayers of conglomerates, limestones, plagioclase porphyrites, and their tuffs, rhyolites. Subvolcanic dikes and sills of liparite-porphyries are widely developed (thickness up to 70m). The formation is 1800 m thick.

Lithology Pattern:

Sandy_claystone

Relationships and Distribution

Lower contact

Contacts are tectonic. Schematic stratigraphic column indicates the lower contact as Sarykul Fm

Upper contact

Contacts are tectonic. Schematic stratigraphic column indicates the upper contact as Atkamar Fm

Regional extent

Kara-Tyube Mountains.

GeoJSON

null

Fossils

Contains crinoids – Pentagonocyclicus elegans Yelt. and others; corals – Catenipora cf. tanaensis Sok. and others.

Age

Age is determined based on lithological similarity with the Altyaul Fm of the Zirabulak–Ziaetdin Mountains and on organic remains.

Age Span:

Beginning stage:

Darriwilian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

469.42

Ending stage:

Hirnantian

Fraction up in the ending stage:

1.0

Ending date (Ma):

443.07

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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