Laiqiaoshan Fm
Period:
Ordovician
Age Interval:
Sandbian, (51)
Province:
Guizhou
Type Locality and Naming
The type section is in the Laiqiao Hill in Sandu, Guizhou. The Laiqiaoshan Fm was named by Guizhou Bureau of Geology and Mineral Resources in 1987.
Synonym: (赖壳山组)
Lithology and Thickness
The Laiqiaoshan Fm is composed of yellow, yellowish green thin-bedded clay siltstone intercalated with silty claystone. It is 23-28 m thick.
Lithology Pattern:
Siltstone
Relationships and Distribution
Lower contact
It rests disconformably on the limestone of the Lanmutan Fm
Upper contact
It is conformably overlain by the quartz sandstone of the Lower Devonian Danlin Fm
GeoJSON
null
Fossils
The Laiqiaoshan Fm yields graptolite of Husterograptus teretiusculus assemblage and trilobite Birmanites hupeiensis, Lonchodomas sp.
Age
Sandbian.
Age Span:
Beginning stage:
Sandbian
Fraction up in beginning stage:
0.1
Beginning date (Ma):
457.63
Ending stage:
Sandbian
Fraction up in the ending stage:
1.0
Ending date (Ma):
452.75
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Jianpo Wang and Xiaofeng Wang