Jiaomuchaka Fm
Period:
Permian
Age Interval:
P
(57), Kungurian Stage (late Cisuralian Epoch) to earliest Guadalupian Epoch (late-Early to earliest-Middle Permian)
(57), Kungurian Stage (late Cisuralian Epoch) to earliest Guadalupian Epoch (late-Early to earliest-Middle Permian)
Province:
Xizang (Tibet)
Type Locality and Naming
The type section is located at the Jiaomuchaka in the alignment of Chabu-Chaka areas, Shuanghu Region, Tibet. It was named by Wu Reizhong et al. in 1986.
Lithology and Thickness
Limestone. Composed of purple-grey brecciated limestone, bio-limestone and oolitic limestone, with a thickness of over 450 m.
Lithology Pattern:
Reef limestone
Relationships and Distribution
Lower contact
Uncertain contact with the underlying strata.
Upper contact
Regional extent
Distributed in the Shuanghu area, Tibet.
GeoJSON
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Fossils
Brachiopods such as Plicatifera, and Fusulinida represented by Nankinella, and Misellina, which might be corresponding to the Misellina claudiae zone and the Nankinella orbicularia zone of the Qixia Fm in South China.
Age
Luodianian and Xiangbo’an Stages of the middle Permian Epoch = Kungurian Stage (late Cisuralian Epoch) to earliest Guadalupian Epoch (late-Early to earliest-Middle Permian)
Age Span:
Beginning stage:
Kungurian
Fraction up in beginning stage:
0.15
Beginning date (Ma):
281.96
Ending stage:
Kungurian
Fraction up in the ending stage:
1.0
Ending date (Ma):
274.37
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Wang Yujing
GeoJSON estimate by Longgang Ye and Yuyin Li (Chengdu Univ. Tech. students)