Hazirbulak Fm

Eastern South Tianshan. The type section is located near Hazirbulak, south of Shanshan County, Xinjiang; and the reference section is at east bank of the lower reaches of Keketiek River in Hejing County, Xinjiang.

It was named by Xinjiang Team of Regional Geological Survey in 1958.

Limestone. In the lower reaches of Keketiek River, this formation is composed of dark-gray massive to thick-bedded limestone intercalated with thin-bedded crystalline limestone and bioclastic limestone. The outcropping thickness is more than 1614 m.

South of Daxifeng to Kaikousi Mt., this formation is composed of dark-gray oolitic limestone, crystalline dolomite and massive limestone. It is 1099 m in thickness.

In east in the Hazirbulak area, this formation, 1389 to 2445 m thick, is composed of light-gray to purplish-red greywacke, feldspathic quartz sandstone, and quartz sandstone with limestone interbeds; the middle part is intercalated with gray to grayish-white thin-bedded limestone and calcareous conglomerate.

In Shashishan of Heshuo County, the formation, more than 694 m thick, consists of gray clayey limestone intercalated with yellowish-green sandstone and shale.

In the lower reaches of Keketiek River, the formation yields brachiopods Tenticospirifer, Yunnanenllina, Camarotoechia, Productella.

South of Daxifeng it yields brachiopods Tenticospirifer, Camarotoechia, Cyrtospirifer, Chonetes.

In east in the Hazirbulak area, this formation yields brachiopods Crytospirifer, Camarotoechia, Productella, Uncinulus, coral and cephalopods.

In Shashishan of Heshuo County, the formation yields brachiopods Yunnanella, Yunnanellina, Cyrtospirifer, Productella, Athyris.