Dzhalpak Fm
Type Locality and Naming
Along the Jalpak ridge on the Merishkor, N. Nuratau range. A. I. Kim et al., 1966 (368, p.95; 441, p.141), in the rank of the upper Silurian. Stratotype to the north of the Chashma-Zrak spring.
Synonym: Dzhaliiskaya Suite, Джалпакская св., Jalpak Fm
Lithology and Thickness
According to data by I.A. Kim et al. (1987), - sparitic, massive, light-gray, detrital and crinoidal, less frequently stromatolite-algal limestones. Thickness 380m.
Relationships and Distribution
Lower contact
Contact with the underlying Chaltash Fm is conformable
Upper contact
Contact with overlying formations is tectonic.
Regional extent
South slope of the Northerrn Nuratau range within the Merishkor structure from the basin of the Kuragan stream in the east to the Say Obay in the west.
GeoJSON
Fossils
Contains tabulates - Pachyfavosites kozlowskii Sok., P. kozlovskii minima Chekh., Cladopora actuosa Yanet., Favosites interstinctus minima Chekh. and others, brachiopods - Platiorthis cimex Kozl., Anastrophia magnifica Kozl., Gypidula optata Barr., Lancemyonia berealiformis Siem., Howellella angustipicata Kozl., Retziella mattschensis Nikif., Uncinulus kekelikensis Nal., Clorindina arataeformis Nikif. and others; conodonts - Ozarkodina eurekaensis (K. et M.), O. remscheidensis repetitor (Carls. et Gondl.), O. excavata excavata (Bronson et Mehl.) and others; trilobites - Liocharpis (Liocharpis) sculptus (H. et C.), Calymene sp., Crotalocephalus myops Roem., Weberopeltis aculeatus Weber. and others, Lower Devonian siphonous algae Lancicula sp.
Age
Depositional setting
Additional Information