Ban Cong Fm
Period:
Devonian
Age Interval:
Givetian, (3)
Province:
Viet Bac
Type Locality and Naming
Stratotype in the Lung Hoai – Sa Tao section (Cao Bang Province) = same section as the overlying Na Dang Fm; named by Vasilevskaia E.D. in Dovzhikov et al (1965).
Lithology and Thickness
Stratotype has 250 m of thick-bedded to massive fine-grained limestone (1) Light-grey; 130 m; the coral Cladopora sp. and brachiopod Stringocephalus. (2) Dark-grey, 50 m. (3) Light-grey, 70 m.
Lithology Pattern:
Reef limestone
Relationships and Distribution
Lower contact
Conformable on the Na Quan Fm
Upper contact
Conformably overlain by the Na Dang Fm
Regional extent
Within the Cao Bang Province
GeoJSON
null
Fossils
Brachiopods, tabulate and rugose corals, stromatoporoids.
Age
Givetian (Middle Devonian)
Age Span:
Beginning stage:
Givetian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
385.30
Ending stage:
Givetian
Fraction up in the ending stage:
0.4
Ending date (Ma):
382.74
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Tran Van Tri and Vu Khuc (Editors; Geology and Earth Resources of Viet Nam, General Dept. of Geology and Minerals of Viet Nam; completed in Dec., 2011), with additional details from Tong-Dzuy Thanh and Vu Khuc (Editors; Stratigraphic Units of Viet Nam, 2nd edition; 2011; English edited by A. Boucot).