Baruntehua Fm
Type Locality and Naming
The type section is located at Baruntehua in the west hill of D, Inner Mongolia Autonomous Region. It was named by Inner Mongolia Team of Regional Geological survey in 1973 during mapping the Dong Ujimqin Qi (Banner) sheet of the Geological Map in scale 1:200,000, and published in the Inner Mongolia Volume, the Paleontological Atlas of North China in 1976.
Lithology and Thickness
Tuff, sandstone-siltstone. The formation is divided into two lithologic members. Lower member is characterized by grayish-green tuffaceous sandstone intercalated with tuffaceous slate, mudstone and green tuff. The thickness is more than 555 m.
Upper member is mainly grayish-green to yellowish-green tuffaceous siltstone intercalated with tuff, and its exposed thickness is 564 m.
Relationships and Distribution
Lower contact
Unknown: The basal boundaries of the formation are not clear.
Upper contact
Unknown: The upper boundaries of the formation are not clear. However, entry for the younger Aobaotinghundi Fm implies that it is conformably overlying and recognized by a lesser amount of tuff.
Regional extent
GeoJSON
Fossils
The lower member contains brachiopods, bryozoan and coral fossils. The upper member yields abundant fossils, mainly brachiopods Coelospira concave, Merista sp., Pacificoulia sinica; coral Cleistopora sp., Barrandeophyllum sp., Syringaxon bohemicum; trilobites Unguliproetus unguloides, and Otarion.
Age
Depositional setting
Additional Information