Bingma Fm
Period:
Permian
Age Interval:
P
(45), Kungurian Stage (late Cisuralian Epoch) through Guadalupian Epoch [latest-Early through Middle Permian]
(45), Kungurian Stage (late Cisuralian Epoch) through Guadalupian Epoch [latest-Early through Middle Permian]
Province:
Yunnan
Type Locality and Naming
The typical profile is the measured profile of the Lower Permian in Hewan Street, Baoshan County, Yunnan (E99°18′00″; N25°09′00″), Yunnan Regional Geological Survey Brigade, surveyed in 1980.
Synonym: Manli Fm (曼里组), Yongde Fm (永德组)
Lithology and Thickness
It is composed of purple silty claystone, gray silty shale and tuff, tuffaceous sand and shale interbedded, and the bottom is clastic rock of iron-bearing tuffaceous sandstone. Contains corals, brachiopods, bryozoans, bivalves, etc. Thickness: 52-135 meters.
Lithology Pattern:
Siltstone
Relationships and Distribution
Lower contact
Disconformable or an unconformable contact with the underlying Woniusi Fm
Upper contact
Conformable contact with the overlying Shazipo Fm
Regional extent
Baoshan, SW Yunnan
GeoJSON
null
Fossils
Age
Yangsingian Epoch = Kungurian Stage (late Cisuralian Epoch) through Guadalupian Epoch [latest-Early through Middle Permian]; Roadian-Wordian (inferred from Wang et al., 2018)
Age Span:
Beginning stage:
Roadian
Fraction up in beginning stage:
0
Beginning date (Ma):
274.37
Ending stage:
Wordian
Fraction up in the ending stage:
0
Ending date (Ma):
269.21
Depositional setting
It is interpreted as littoral shallow-sea deposits.
Depositional pattern:
Additional Information
Compiler:
Wang Yujiang, Wen Du – modified from Wang X.W. et al., 2018. Stratigraphic Division and Correlation of The Carboniferous and Permian in Yunnan Province. Journal of Stratigraphy, 42(4): 461-467 (in Chinese with English abstract)