Lianhuakou Fm
Period:
Jurassic, Cretaceous
Age Interval:
Latest Jurassic-earliest Cretaceous, (TJ81)
Province:
Sichuan
Type Locality and Naming
Sichuan Basin (northern). Type section at Lianghekou (Lianhuakou), 5 km north of Jianmenguan, Jiange County, Sichuan Province. Named by Hou T F, Wang H H, 1939, Bull. Geol. Surv. Szechuan. Lowest formation in the Chengqiangyan Gr.
Synonym: Lianhuakou Conglomerate
Lithology and Thickness
Brick-red sandy mudstone. Synonym implies conglomerate at base?
Lithology Pattern:
Sandy claystone
Relationships and Distribution
Lower contact
Overlies the Suining Fm of latest Jurassic.
Upper contact
Overlain by the Jainmenguan Fm (lower-middle formation in the Chengqiangyan Gr in northern Sichuan Basin).
Regional extent
Northern Sichuan Basin. Equivalent to the Penglaichen Fm in the middle part of the basin.
GeoJSON
null
Fossils
Age
Schematic strat column in previous "red Chinese Lexicon" implied that the Lianhuakou Fm was late Kimmeridgian. Diying Huang (2019; Jurassic integrative stratigraphy and timescale of China. Science China: Earth Sciences, v. 62) re-assigns this Lianhuakou Fm as late Tithonian-early Berriasian.
Age Span:
Beginning stage:
Tithonian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
146.17
Ending stage:
Berriasian
Fraction up in the ending stage:
0.5
Ending date (Ma):
140.40
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Information from Geological Formation Names of China (1866-2000), Springer; and from Li, Yuwen (1984; Some new late Jurassic to early Cretaceous nonmarine ostracods from Sichuan Basin of China. Jour. Palentology, 58: 217-233).