Jiuda Fm
Period:
Jurassic
Age Interval:
Upper Jurassic, (TJ10a).
Province:
Jilin, Liaoning
Type Locality and Naming
Type section at Jiuda in Youfeng County, Liaoning Province. Named by Si Xingjian, Zhou Zhiyan, 1962, Mesozoic Continental Stratigraphy of China, Beijing: Science Press, 73. First appeared in a 1954 manuscript by No. 1 Northeast China Coal Field Geological Exploration Team.
Synonym: Jiuda Coal Beds
Lithology and Thickness
Volcanic rocks with interbeds of coal seams.
Lithology Pattern:
Coal
Relationships and Distribution
Lower contact
Next older regional unit is the Deren Fm
Upper contact
It is in a conformal contact with the overlying Anmin Fm
Regional extent
GeoJSON
null
Fossils
Age
Implied by temporary age assignment of the overlying/underlying formations to be early Tithonian (very uncertain).
Age Span:
Beginning stage:
Tithonian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
149.24
Ending stage:
Tithonian
Fraction up in the ending stage:
0.5
Ending date (Ma):
146.17
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Jingeng Sha (coordinator)
Excerpts from Geological Formation Names of China (1866-2000), Springer.