Xilanta Fm
Period:
Permian
Age Interval:
P
(52), mid-Guadalupian Epoch (mid-Middle Permian)
(52), mid-Guadalupian Epoch (mid-Middle Permian)
Province:
Xizang (Tibet)
Type Locality and Naming
The type section is located on the eastern flank of the Jiangyema area about 100 km to the southeast of the Zhada County, Tibet. It was named by the Tibetan Regional Reconnaissance Party in 1987.
Lithology and Thickness
Limestone. Composed of purple limestone, brecciated limestone and bioclastic limestone, intercalated with two layers of basic volcanic rocks, and with a thickness of over 1373.4 m.
Lithology Pattern:
Limestone
Relationships and Distribution
Lower contact
Uncertain relationship with the underlying strata (Xiajuripu Fm)
Upper contact
Uncertain relationship. Next younger regional unit is the Jiangyema Fm
Regional extent
GeoJSON
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Fossils
Yields Fusulinids such as Neoschwagerina, Pseudodoliolina, Chusenella, Verbeekina, Yangchienia, and Eopolydiexodina, etc.
Age
Kufengian Stage of the Yangsingian Epoch = mid-Guadalupian Epoch (mid-Middle Permian)
Age Span:
Beginning stage:
Roadian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
274.37
Ending stage:
Capitanian
Fraction up in the ending stage:
1.0
Ending date (Ma):
259.55
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Wang Yujing