Home Multi-Country Search About Admin Login
Cenozoic
Cretaceous
Jurassic
Triassic
Permian
Carboniferous
Devonian
Silurian
Ordovician
Cambrian
Neoproterozoic
Mesoproterozoic

Search by
Select Region(s) to search
Hold Ctrl (Windows/Linux) or Command (Mac) to select multiple
Penglaichen Formation

Penglaichen Fm

Period: 
Jurassic, Cretaceous

Age Interval: 
Latest Jurassic-earliest Cretaceous, (TJ79)


Province: 
Sichuan

Type Locality and Naming

Sichuan Basin (middle). Type section at Penglaizhen in Sichuan Province. Named by Sheng Xinfu, 1962, Acta Geologica Sinica, 42(1): 31–54. First appeared in a 1946 manuscript by Yang Boquan and Sun Wanquan. Lowest formation in the Chengqiangyan Gr.

Synonym: Penglaizhen Sandstone Beds, Penglaichen Fm (spelling)


Lithology and Thickness

Alternating beds of grayish purple sandstone and brownish red mudstone.


Lithology Pattern: 
Clayey sandstone


Relationships and Distribution

Lower contact

Overlies the Suining Fm of latest Jurassic.

Upper contact

Overlain by the Changxi Fm (lower-middle formation in the Chengqiangyan Gr in the central Sichuan Basin).

Regional extent

Middle Sichuan Basin. Equivalent to the Lianhuakou Fm in the northern part of the basin.


GeoJSON

null

Fossils

This formation contains among other taxa Darwinula oblonga (Roemer, 1839), D. giganimpudica Wang and Ye, 1977, D. subparallela Ye, 1977, D. sp. cf. D. leguminella (Forbes, 1855), Damonella shuangbaiensis Gou, 1977, Djungarica yunnanensis Ye, 1977, and Mongolianella sp. cf. M. palmosa Mandelstam, 1955.


Age 

Schematic strat column in previous "red Chinese Lexicon" implied that the Penglaichen Fm was late Kimmeridgian. Diying Huang (2019; Jurassic integrative stratigraphy and timescale of China. Science China: Earth Sciences, v. 62) re-assigns this Penglaichen Fm as late Tithonian-early Berriasian (assuming equivalent to the Suining Fm in north Sichuan Basin).

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).