Brichmullin Formation

Brichmullin Fm

Period:

Devonian

Age Interval:

Famennian, CK3, CK5, CK7

Province:
Chatkal-Kuramin Region

Type Locality and Naming

Along the village of Brichmulla, Chatkal Ridge. A.A. Denisuk, G.D. Azhgirey in 1932 on the right bank of the Koksu River (40, pp.609-611; 457, pp.160-161). During further geological surveying, it was reclassified as a suite.

Synonym: Brichmullinskaya Suite, Bricheulinsk suite, Бричмуллинская св.

Lithology and Thickness

Thin-bedded, clayey-silty limestones, yellowish-gray, interbedded with dolomites, with a sulfur smell, layers of marls, thin interlayers of argillites, siltstones, and less frequently fine-grained sandstones. Thickness: 50-95m.

Lithology Pattern:

Clayey limestone

Relationships and Distribution

Lower contact

It conformably overlies the Kokterek Fm. It is also shown as lower contact with Tepar Fm in schematical stratigraphic representation as it constitutes the lower subsuite of the Kokterek Fm

Upper contact

Conformably underlies the Chavatin Fm

Regional extent

Locally in the Chatkal Range, lower reaches of the Koksu River, and along the Akbulak River. Along A.P. Titova, Ya.S. Levin, and others, the B. suite is facially replaced by the Kokterek Fm (460).

GeoJSON

null

Fossils

Brachiopods - Schellwienella umbraculum Schl., Cyrtospirifer julii Dehee., Adolfia deflexa Roem., and others; stromatoporoids - Labechia regularis Riab., Stylostroma stylophorum Nich., and others.

Age

Late Famennian age is established by brachiopods

Age Span:

Beginning stage:

Famennian

Fraction up in beginning stage:

0.7

Beginning date (Ma):

362.84

Ending stage:

Famennian

Fraction up in the ending stage:

0.8

Ending date (Ma):

361.66

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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