Xikeng Formation

Xikeng Formation
Xikeng Formation
Stratigraphic range: Telychian–Early Devonian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Underlies	Xiaoxi Formation
Overlies	Xiajiaqiao Formation
Lithology
Primary	Sandy mudstone, siltstone
Other	Sandstone
Location
Location	Xiushui County
Region	Jiangxi Province
Country	China

Last updated September 10, 2025

The Xikeng Formation is located in Xiushui County, Jiangxi Province, and contains alternating beds of purplish red, grayish green and yellow green sandy and muddy rocks. The Xikeng Formation is dated to the Late Silurian - Early Devonian period.^[2]

A new outcrop was identified within Baishui town in 2025 which extended the age of the Xikeng Formation to 436 million years ago.^[3]

References

↑ Shan, Xianren; Zhu, Min; Zhao, Wenjin; Pan, Zhaohui; Wang, Pingli; Gai, Zhikun (15 May 2020). "A new genus of sinogaleaspids (Galeaspida, stem-Gnathostomata) from the Silurian Period in Jiangxi, China". PeerJ. 8 e9008. doi: 10.7717/peerj.9008 . ISSN 2167-8359. PMC 7233274 . PMID 32461826.
↑ Zhang, Shouxin (2009). Geological Formation Names of China. Springer. p. 1253. ISBN 978-3540-93823-1.
↑ Lin, X.; Zan, C.; Gai, Z.; Zhu, M. (2025). "Deanaspis, a new genus of Galeaspida (jawless stem Gnathostomata) from the Silurian of Jiangxi, China, and its evolutionary implications". Journal of Systematic Palaeontology. 23 (1). 2460479. Bibcode:2025JSPal..2360479L. doi:10.1080/14772019.2025.2460479.

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[1] Shan, Xianren; Zhu, Min; Zhao, Wenjin; Pan, Zhaohui; Wang, Pingli; Gai, Zhikun (15 May 2020). "A new genus of sinogaleaspids (Galeaspida, stem-Gnathostomata) from the Silurian Period in Jiangxi, China". PeerJ. 8 e9008. doi: 10.7717/peerj.9008 . ISSN 2167-8359. PMC 7233274 . PMID 32461826.

[2] Zhang, Shouxin (2009). Geological Formation Names of China. Springer. p. 1253. ISBN 978-3540-93823-1.

[Deanaspis-3] Lin, X.; Zan, C.; Gai, Z.; Zhu, M. (2025). "Deanaspis, a new genus of Galeaspida (jawless stem Gnathostomata) from the Silurian of Jiangxi, China, and its evolutionary implications". Journal of Systematic Palaeontology. 23 (1). 2460479. Bibcode:2025JSPal..2360479L. doi:10.1080/14772019.2025.2460479.

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