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

Khavzak Formation

Khavzak Fm

Period:

Devonian

Age Interval:

Lochkovian, Z1

Province:
Zarafshan-N.Gissar

Type Locality and Naming

Along the Havzak River, Arg Basin, Central Tajikistan. A.I. Lavrushevich, V.I. Lavrushevich, 1972 (262, p. 63). Stratotype along the Havzak River. Previously considered as the Upper Arg sub-suite. Upper formation in Arg Gr.

Synonym: Havzak Suite, Хавзакская св.

Lithology and Thickness

Dark gray to black, layered to massive, variably dolomitized limestones. Thickness is 150 m.

Lithology Pattern:

Dolomitic limestone

Relationships and Distribution

Lower contact

It lies conformably on the Kupruk Fm

Upper contact

Conformably overlies the Bursyhirman Horizon in the Obisafy type of sections, the Turkparidin - Turkparidin Fm, the Chakylkalyan Fm - Akbasay Fm.

Regional extent

Zarafshan-Gissar mountain region.

GeoJSON

null

Fossils

Contains tabulates - Favosites socialis Sok. et Tes., Pachyfavosites kozlowskii Sok.; rugosans - Tryplasma aequabilis Lonsd., Chavsakia chavsakiensis Lavrus., Holmophyllum taltiense Nikol., Strephophyllum turkparidense Lavrus., brachiopods - Lissotrypa alexandria Nikif., L. nasa Nikif., L. caudota Nikif., Retzia (?) argensis Nikif.

Age

It belongs to the Zhdinian stage (379). A.I. Lavrushevich." Stratigraphic Lexicon (443). In the modern understanding - to the Lochkovian stage.

Age Span:

Beginning stage:

Lochkovian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

419.00

Ending stage:

Lochkovian

Fraction up in the ending stage:

0.5

Ending date (Ma):

415.70

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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