Magongtan Fm
Period:
Silurian
Age Interval:
Early Telychian of Silurian (S1), (49)
Province:
Sichuan
Type Locality and Naming
It was named by Mu Enzhi et al. in 1983. The type section is at Magongtan, north of the Shuanghe Township, Changning County in southwestern Sichuan Province.
Synonym: (马公滩组)
Lithology and Thickness
The Lower and Middle parts of the formation, 206 m thick, are composed of interbeds of yellow green mudstone with silty mudstone; the sandy component increases gradually upwards and sandy mudstone with rich trace fossils is developed as well. The Upper part, 74 m thick, consists of blue gray, or brown yellow by weathering, medium- and thick-bedded quartzose sandstone with no fossils found yet.
Lithology Pattern:
Sandy claystone
Relationships and Distribution
Lower contact
The Magongtan Fm rests conformably onto the underlying Lingxiqiao Fm
Upper contact
The Magongtan Fm rests conformably below the overlying Xiushan Fm
GeoJSON
null
Age
Age Span:
Beginning stage:
Telychian
Fraction up in beginning stage:
0.25
Beginning date (Ma):
437.18
Ending stage:
Telychian
Fraction up in the ending stage:
0.5
Ending date (Ma):
435.76
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Wang Chuanshang and Wang Xiaofeng