Boordin Formation

Boordin Fm

Period:

Devonian

Age Interval:

Middle-Upper Devonian (Givetian-Frasnian), F10b

Province:
Fergana

Type Locality and Naming

Along the city of Boordy, Alai range. V.B. Goryanov, L.V. Kusnary in 1958 (176, p.18). Stratotype on the northern slope of Mount Boordy, upper course of Boordysaya. Lower formation in Alay Gr.

Synonym: Boordinskaya Suite, Боординская св.

Lithology and Thickness

Dolomites and limestones containing loaf-shaped flint concretions. Thickness 180-750m

Lithology Pattern:

Dolomitic limestone

Relationships and Distribution

Lower contact

It lies conformably or sometimes with erosion on the Arpalyk Fm

Upper contact

It is conformably or with hidden unconformity overlain by the Adyrakou Fm. (441; 460).

Regional extent

Alai Ridge.

GeoJSON

null

Fossils

The lower part with tabulates - *Favistella rhenana* Frech.; corals - *Neostringophyllum cf. waltheri* Yoh. and brachiopods - *Stringocephalus burtini* Defr., belong to the lower Givetian substage; the upper part with amphiporids - *Amphipora patokensis* Riab.; corals - *Neostringophyllum cf. heterophylloides* Frech., *Thamnophyllum cf. murchisoni* Penecke, corresponds to the lower Frasnian substage

Age

Fossil data indicates Givetian-lower Frasnian

Age Span:

Beginning stage:

Givetian

Fraction up in beginning stage:

0.8

Beginning date (Ma):

380.18

Ending stage:

Frasnian

Fraction up in the ending stage:

0.4

Ending date (Ma):

375.78

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)"