Kyzkolysay Fm
Type Locality and Naming
Along the Kyzkolysay, North Nuratau Range. P.N. Podkopaev et al. in 1961 (1964f.). The age and extent of the formation were refined by E.V. Chukarov et al. (1966f.) and Z.M. Abduazimova et al. (1989f.; 11; 1996f.). Stratotype at Kyzkolsay.
Synonym: Kyzkolysay Suite, Кызколысайская св.
Lithology and Thickness
Thinly bedded, dark gray (to black) claystone (argillites), argillaceous slates with subordinate layers (3-5 cm, rarely 10-15 cm) of organogenic, thinly bedded clayey limestones and calcareous silty claystone (aleuropelites). Thickness 15-20, up to 50 m.
Relationships and Distribution
Lower contact
The lower boundary of the formation is unknown
Upper contact
The upper boundary is not reliably established. Judging by the regular replacement of organic residue complexes in the section, its relationship with the Ludlovian part of the East Daristan Fm was stratigraphically normal (165).
Regional extent
North Nuratau Range, occurring in the form of tectonic scales within the Mikhin-Daristanskaya structure. The Kyzkolysay Fm in the accepted span corresponds to the lower part of the Urtakul Fm in the understanding of I.A. Kim. The carbonate part of the section, included by P.N. Podkopaev (1964) and I.A. Kim (1987) in the Kyzkolysay Fm, belongs to the carbonate shallow-water type of section and is included in the Urtakul Fm (see).
GeoJSON
Fossils
Contains graptolites - Testograptus testis (Barr.), Monoclimacis flumendosae (Gort.), Monograptus flemingi (Salter.) and others, characteristic of the upper Wenlock; chitinozoa - Eisenackitina oviformis (Eis.), E. dolioliformis Umn., Linochitina erratica (Eis.), known in the Wenlock of many regions of the world.
Age
Depositional setting
Additional Information