Guqin Fm
Period:
Ordovician
Age Interval:
Tremadocian-Floian, (59)
Province:
Xizang (Tibet)
Type Locality and Naming
The type section is at Guqin in Goyü district, Zayü County, Xizang. The Guqin Fm was named by Yin Jixiang et al. in 1973, and was published by Chen Ting'en (1984) who mistook the Guqin Fm for the Gujin Fm.
Synonym: (古琴组）
Lithology and Thickness
The formation is composed of grayish yellow thin-bedded siltstone, fine-grained sandstone, phyllite, slate and sericite schist; and light gray dolomitic limestone (upper part). In the type area, the Guqin Fm recorded an incomplete thickness of 150 m.
Lithology Pattern:
Sandy limestone
Relationships and Distribution
Lower contact
With a covered lower boundary.
Upper contact
It is conformably overlain by the argillaceous limestone of the Zayu Fm
Regional extent
This unit is only seen in the type area (Zayu County, Xizang).
GeoJSON
null
Age
Tremadocian-Floian.
Age Span:
Beginning stage:
Tremadocian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
486.85
Ending stage:
Floian
Fraction up in the ending stage:
0.4
Ending date (Ma):
474.75
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Jianpo Wang and Xiaofeng Wang