Baotege Fm
(11), early Middle Permian
Type Locality and Naming
The type section is located at Baotege (Baoyintuo) 6 km to the southeast of the Mandula Country, the United Banner of Darhan and Maomingan, Inner Mongolia. It was named by Jiang Haoxian et al. from the Inner-Mongolian 1st Regional Geological Survey Party in 1980.
Lithology and Thickness
Mixed lithologies. Basal part is composed of conglomerate, with the pebbles being represented by quartz-sandstone, limestone and slate, and with the sand serving as its cement, with a thickness of over 80 m. Lower part is composed of brown calcareous sandstone and thin-bedded limestone, intercalated with white thick-bedded pebble-bearing greywackes, yielding abundant Fusulinida fossils, and with a thickness of 302 m. Upper part of the formation is composed of grey-green siltstone, intercalated with thin-bedded limestone, yielding Fusulinida, brachiopods and Cephalopoda fossils, with a thickness of 383 m.
Relationships and Distribution
Lower contact
Disconformable contact: The basal conglomerate strata of the formation is in a disconformable contact with the underlying Lower Permian Series, but in the area of the Siwangzi Banner it is in an unconformable contact with the Xilimiao Fm;
Upper contact
Conformable contact to the overlying Zhesi Fm.
Regional extent
This formation is distributed in the area of Mandula of the United Banner of Darhan and Maomingan, Inner Mongolia.
GeoJSON
Fossils
Fusulinida such as the Monodiexodina sutschanica baotegensis;
Brachiopods such as Yakovlevia unsinuata, Anidanthus ussuricus;
Cephalopoda such as Tainoceras subquadratum.
Age
Depositional setting
It is interpreted as relatively deep-water flysch deposits.
Additional Information