Yanjiahe Formation Explained

Yanjiahe Formation
Type:	Formation
Period:	Fortunian
Age:	Ediacaran - Fortunian ~
Prilithology:	Shale, limestone, dolomite
Otherlithology:	Chert, phosphorite
Region:	Hubei
Overlies:	Dengying Formation
Extent:	Yangtze Gorges
Coordinates:	30.8°N 111.3°W
Paleocoordinates:	27.6°N 160.2°W

The Yanjiahe Formation is an Ediacaran to Cambrian fossiliferous geologic formation found in South China.^{[1] [2]}

Fossil content

Among others, the following fossils were found in the formation:^[2]

• Aldanella attleborensis^[3]
• Anabarites trisulcatus^[3]
• Archaeophycus yunnanensis^[4]
• Beretella spinosa^[5]
• Comasphaeridium annulare^[1]
• Conotheca subcurvata^[3]
• Emeiconus antiqua^[3]
• Heliosphaeridium ampliatum^[1]
• Megathrix longus^[1]
• Micrhystridium regulare^[3]
• Protoconites minor^[3]
• Purella antiqua^[3]
• Yanjiahella biscarpa^[6]
• Lapworthella sp.^[3]
• Protohertzina sp.^[3]
• Vendotaenia sp.^[3]
• Yuknessia sp.^[3]
• ?Konglingiphyton sp.^[3]

References

Bibliography

• • • • Early evolution of the ecdysozoan body plan . Wang . Deng . Qiang . Yaqin . 2024-02-19 . 10.7554/elife.94709.1 . Guo . Junfeng . Vannier . Jean . Song . Zuchen . Peng . Jiaxin . Zhang . Boyao . Sun . Jie . Yu . Yilun. free .

Further reading

• J. Guo, Y. Li, and G. Li. 2014. Small shelly fossils from the early Cambrian Yanjiahe Formation, Yichang, Hubei, China. Gondwana Research 25:999-1007
• P. Chen. 1984. Discovery of Lower Cambrian small shelly fossils from Jijiapo, Yichang, west Hubei and its significance. Professional Papers of Stratigraphy and Palaeontology 13:49-64

Notes and References

1. Dong et al., 2009
2. http://www.fossilworks.org/cgi-bin/bridge.pl?action=displayStrata&geological_group=&formation=Yanjiahe&group_formation_member=Yanjiahe Yanjiahe Formation
3. Guo et al., 2009
4. Dong et al., 2009
5. Wang et al., 2024
6. Topper et al., 2019