Kazansay Formation

Kazansay Fm

Period:

Devonian

Age Interval:

Eifelian, U5

Province:
Ustyurt-Sultanuzdag

Type Locality and Naming

Along Kazansay, Sultanuizdag Mountains. A team of geologists from the Uzbek Geological Management in 1958 (Alferov, Kulesh, 1965; 508, pp. 49-56).

Synonym: Kazansay Suite, Казансайская св.

Lithology and Thickness

Divided into three sub-suites.

Lower - calcareous-schistose (biotite)-quartz slates with thin layers of brownish-yellow-gray limestones. Thickness 60-70m.

Middle - at the bottom, thin interbedding of quartz-feldspar-biotite slates and marbled limestones (Thickness 35-45m), above - marbled limestones and marbles (Thickness 180m).

Upper - quartz-feldspar-biotite, two-mica, calcareous-schistose slates. Thickness 180m.

Lithology Pattern:

Claystone

Relationships and Distribution

Lower contact

The volume of the suite and its position in the section are interpreted differently. K.A. Keshishyan (1995) considers the contacts with the underlying Karakuduk Fm to be normally stratigraphic or unclear; Z.M. Abdurazimova - tectonic.

Upper contact

The volume of the suite and its position in the section are interpreted differently. K.A. Keshishyan (1995) considers the contacts with the overlying Beshmazar Fm to be normally stratigraphic or unclear; Z.M. Abdurazimova - tectonic.

Regional extent

Central and eastern parts of the Sultanuizdag ridge, to the south and north of the greenstone belt of the Karakuduk suite. V.V. Mikhailov (460) includes only the carbonate deposits with the fauna of the Lower-Middle Devonian in the K. suite, and the quartz-feldspar-biotite and other crystalline slates are assigned to the Sultanuizdag Gr of the provisional Proterozoic.

GeoJSON

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Fossils

Lower – Limestones contain crinoids - Pentagonocyclicus radialis Yelt., P. textus Dubat., P. costatus Schew., P. cf. tianshanicus Schew., P. ex gr. scabrum Schew., P. Flexus Yelt., Cyclocyclicus cf. laticanalis Yelt., C. latus Yelt., C. proximus Dubat., Desmidocrinus longicostatus Schew.

Middle – Carbonates contain crinoids - Pentagonocyclicus multiradialis Yelt., P. Flexus magna Yelt., P. Flexus Yelt., P. cf. radialis Yelt., P. astericus Schew., Cyclocyclicus laticanalis Yelt., C. latus Yelt., Entrochus cf. nodulosus Barr., E. laevis lineatus Quenst., Pentagonopentagonalis pennatus Yelt., Cupressocrinites gracilis Goldf., C. crassus Goldf., C. abbreviatus Quenst., Desmidocrinus longicostatus Schew., Hexacrinites humilicarinatus Yelt., Rhodocrinus cf. verus Quenst., Cyathocrinus rugosus Miller, Kazakhstanocrinus asperum Schew., tabulates - Thamnopora sp., Caliapora chaetetoides Lec.; stromatoporoids - Amphipora cf. regularis Less., A. cf. spissa Yavor., A ex gr. stellopora intexta Yavor., Stellopora cf. kirgisica Zachar., foraminifers - Parastegnammina pseudocamerata Pojark., Eotuberitina reitlingerae A. Mikl.-Macl., Vicinesphaera angulata Antr., Cribrisphaeroides sp.; gastropods, algae.

Age

Based on the fauna complex, the age of the suite can be interpreted in the interval of the Pridoli epoch of the Early Devonian - Middle Devonian, Givetian. In the Stratigraphic Lexicon (441), it is assigned to the Eifelian stage of the Middle Devonian.

Age Span:

Beginning stage:

Eifelian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

394.30

Ending stage:

Eifelian

Fraction up in the ending stage:

1.0

Ending date (Ma):

385.30

Depositional setting

Depositional pattern:

Additional Information

Compiler:

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