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

Mullamalin Formation

Mullamalin Fm

Period:

Silurian

Age Interval:

Upper Wenlock, N7

Province:
Nuratau

Type Locality and Naming

Along the village of Mulla-Maly, eastern part of Karachatay, South Nuratau Range. O.N. Khaletskaya, 1962 (483, p.52) as a horizon, covering the deposits of the Wenlock (457, p.38). V.S. Korsakov, R.R. Usmanov, and others (1993) refer to this suite as the Naukatsay Fm.

Synonym: Mullamalin Formation, Мулламалинская св., Mulla-Malya Fm

Lithology and Thickness

In the lower part, polymictic and tuffogenic sandstones of various grain sizes, interbedded with siltstone (aleurolites), predominate. Higher up, polymictic siltstone (aleurolites) and siliceous-schistose slates are found. At the boundary between sandstones and siltstone (aleurolites), various mekhano glyphs, traces of sediment flow, ripple marks, and sometimes cross-bedding are observed. Thickness 180-250m.

Lithology Pattern:

Fine-grained sandstone

Relationships and Distribution

Lower contact

Contacts with underlying deposits are disturbed (371), but O.N. Khaletskaya (457) and in the Strat. sl. (441) suggested a transgressive overlap of the suite on Llandovery deposits

Upper contact

Conformable overlap by Ludlow deposits.

Regional extent

South Nuratau, water-dividing part and northern slope of Karakchatay from the Tusun River in the west to the Karasu village in the east; Gobduntay Mountains, central watershed of the Almaly River. The Mullmalin Fm is an age and lithological analogue of the Kushkumbay Fm of S. Tamdytau of Kyzylkumov.

GeoJSON

null

Fossils

Graptolites - Testograptus testis (Barr.), Monograptus flemingi (Salter.), Cyrtograptus sp., and others.

Age

The Late Wenlock age is established by graptolites.

Age Span:

Beginning stage:

Homerian

Fraction up in beginning stage:

0.3

Beginning date (Ma):

429.46

Ending stage:

Homerian

Fraction up in the ending stage:

1.0

Ending date (Ma):

426.74

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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