Naukatsay Fm
Type Locality and Naming
Along Naucats, N. Nuratau Ridge. N.R. Asatullaev et al. (1970f), span and age clarified by R.R. Usmanov et al. (1989f). Stratotype Along Naucats.
Synonym: Naukatsayskaya Formation, Наукатсайская св.
Lithology and Thickness
Upper part (Thickness of 100-130m) - rhythmically interbedded quartz sandstones, siltstone (aleurolites), quartz-mica shales.
Lower part (Thickness of 60-70m) - thin-bedded variegated argillaceous shales, silty claystone (aleurolitic argillites) with layers of thin-bedded feldspar-quartz siltstone (aleurolites) and silty-claystone (aleuropelites) with horizontal and oblique wavy stratification and hieroglyphs.
Total Thickness 200m (165; 460m).
Relationships and Distribution
Lower contact
According to A.A., the lower boundary with the Dzhazbulak Fm is conformable
Upper contact
The upper boundary is conformable with the Karachatal Fm (Karakchatau, Mulla-Malya basin).
Regional extent
South slope of North Nuratau Ridge; eastern part of S. Nuratau Ridge; Gobduntau Mountains. According to R.R. Usmanov et al. (1989f.), it corresponds to the upper part of the Alyanguz Fm and to the Mulla-Malya Fm in the understanding of I.A. Pyanova (371). (165; 443; 460).
GeoJSON
Fossils
Upper part – Wenlock (Homerian) graptolites - Testograptus testis (Barr.), Monoclimacis flumendosae (Gort.), Cyrtograptus radians Törnq. and others.
Lower part – Contains Wenlock (Sheinwood) graptolites - Monograptus riccartonensis Lapw., M. firmus Bouček., M. priodon (Broun.); chitinozoa - Linochitina erratica (Eis.), Cingulochitina cingulata (Eis.), Calpichitina densa (Eis.), Margachitina margaritana (Eis).
Age
Depositional setting
Additional Information