Haishenghala Fm
Type Locality and Naming
Inner Mongolia-Ningxia border region. The Haishenghala Fm was named by Zheng Shaochang and Zhang Luyi in 1973 and formally published on Ningxia subdivision of Regional Stratigraphic Scale of Northwest China in 1980. The typical section is situated at Haishenghala in Alxa Zuoqi of Nei Mongol Zizhiqu (Inner Mongolia Autonomous Region).
Synonym: （海生哈拉组）
Lithology and Thickness
The Haishenghala Fm is subdivided into two members. Lower member is dominated by variegated slate, quartzite intercalated with grayish yellow and brownish gray stromatolite-bearing limestone lenses and thin-bedded limestone. The slate is commonly intercalated with hematite and manganese ore lenticles. The lower part of the Upper member is variegated slate bearing small manganese-iron lenticles, with a 5 m-thick basal conglomerate. The middle part of the upper member is a greenish gray slate interbedded with pelitic nodular limestone, bearing lenticles or beds of manganese ore and a bed of glauconitic sandstone in the base. Its upper part, pelitic limestone is interbedded with variegated slate. The total thickness varies from 87 to 216 m
Relationships and Distribution
Lower contact
The basal part with gray to grayish brown pelitic slate rests disconformably on the underlying Bayinxibie Gr (Jixian, late Mesoproterozoic).
Upper contact
The upper part with white to gray thin-bedded pelitic limestone interbedded with slate has a fault contact with the overlying Zhulazhagamaodao Fm
Regional extent
Inner Mongolia-Ningxia border region. Alxa Zuoqi of Inner Mongolia
GeoJSON
Fossils
The limestone yields stromatolites, dominated by Katavia f., Clavaphyton f., Scopulimorpha f. etc. The slate yields microplants Laminarites sp., Taeniatum crassum etc.
Age
Depositional setting
Additional Information