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Jehol Gr

Jehol Gr

Period: 
Cretaceous

Age Interval: 
Early Cretaceous, (26) K1jG


Province: 
Liaoning, Hebei

Type Locality and Naming

Grabau erected the Jehol series in 1923. Chen Peiji (1980) named the Jehol Group for the strata bearing the Jehol biota. The definition of the group is in disagreement. Generally, its implication is identical with biostratigraphy. Its lower part equivalent with the Dabeigou Fm yielding early Jehol biota; middle-upper part includes the Yixian Fm and Jiufotang Fm containing main body of the Jehol biota. [Note that Dabeigou Fm is in a different basin than the Yixian Fm, which in turn is above a hiatus.] Jingeng Sha (in Kosenko et al. (2021) also includes the Fuxin Fm that overlies the Jiufotang Fm in western Liaoning.

From Kosenko et al. (2021): In ascending order, the Jehol Group consists of the Yixian Fm (=Jingangshan Fm, Tuhulu Fm, Jianchang Fm, Lower Volcanic Fm, Volcanic Rocks Fm, Dalinghou Fm, and probably the Zhanglaogongtun Fm), Jiufotang Fm (=Shahai Fm) and Fuxin Fm (=Binggou Fm, Haizhou Fm, lower Banlashan Fm and Upper Volcanic Fm) (Sha, 2007a; Sha et al., 2012).


Lithology and Thickness

The Jehol Group is represented by a set of volcanic-sedimentary rocks, and characterized by its well-known Jehol biota.


Lithology Pattern: 
Volcanics


Relationships and Distribution

Lower contact

It lies unconformably on the underlying Zhanjiakou Fm.

Upper contact

It lies unconformably under the Sunjiawan Fm (using diagram in Kosenko et al., 2021).

Regional extent


GeoJSON

null

Fossils

None listed


Age 

"These ages suggest that the Jiufotang Formation [= middle to upper Jehol Gr] in Jianchang Basin was deposited at ca. 122.0–118.9 Ma, the latest Barremian–Aptian stage" (Zhiqiang Yu et al., 2021, "New geochronological constraints for the Lower Cretaceous Jiufotang Formation in Jianchang Basin, NE China, and their implications for the late Jehol Biota", Palaeo-3, 583, article #110657, https://doi.org/10.1016/j.palaeo.2021.110657). If the Fuxin Fm is included in Jehol Gr, then it extends upward to mid-Albian (as diagrammed in Kosenko et al., 2021). A total of Barremian through mid-Albian is implied by Kosenkeo et al. (2021), but other formations with "earliest Jehol fauna" have ages projected as Hauterivian or even late Valanginian (e.g., radioisotopic dates from the Dabeigou Fm)

Age Span: 

    Beginning stage: 
Barremian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
126.50

    Ending stage: 
Albian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
106.85

Depositional setting


Depositional pattern:  


Additional Information


Compiler:  

Wan Xiaoqiao

Enhanced with Igor N. Kosenko, Jingeng Sha and Boris N. Shurygin (2021). Upper Mesozoic stratigraphy of Sikhote-Alin (Russian Far East) and northeastern China: Non-marine and marine correlations. Part 1: Upper Jurassic-Hauterivian AND 2. Barremian-Aptian. Cretaceous Research, 124: articles 104811 (https://doi.org/10.1016/j.cretres.2021.104811) AND 104812 (https://doi.org/10.1016/j.cretres.2021.104812)