Yanjiahe Formation

Yanjiahe Formation
Stratigraphic range: Ediacaran - Fortunian ~542–529  Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Formation
Overlies	Dengying Formation
Lithology
Primary	Shale, limestone, dolomite
Other	Chert, phosphorite
Location
Coordinates	30°48′N111°18′E / 30.8°N 111.3°E / 30.8; 111.3
Approximate paleocoordinates	27°36′N160°12′E / 27.6°N 160.2°E / 27.6; 160.2
Region	Hubei
Country	China
Extent	Yangtze Gorges
Yanjiahe Formation (China) Show map of China Yanjiahe Formation (Hubei) Show map of Hubei

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

References

1. Dong et al., 2009
2. Yanjiahe Formation at Fossilworks.org
3. Guo et al., 2009
4. Wang et al., 2024
5. Topper et al., 2019

Bibliography

• Topper, Timothy P.; Guo, Junfeng; Clausen, Sébastien; Skovsted, Christian B.; Zhang, Zhifei (2019), "A stem group echinoderm from the basal Cambrian of China and the origins of Ambulacraria", Nature Communications , 10 (1): 1366, Bibcode:2019NatCo..10.1366T, doi:10.1038/s41467-019-09059-3, ISSN   2041-1723, PMC   6433856 , PMID   30911013
• Dong, Lin; Xiao, Shuhai; Shen, Bing; Zhou, Chuanming; Guoxiang, Li; Yao, Jinxian (2009), "Basal Cambrian Microfossils from the Yangtze Gorges Area (South China) and the Aksu Area (Tarim Block, Northwestern China)" , Chemical Geology , 83 (1): 30–34, Bibcode:2009JPal...83...30D, doi:10.1666/07-147R.1 , retrieved 2014-08-15
• Guo, J.; Li, Y.; Han, J.; Zhang, X.; Zhang, Z.; Ou, Q.; Liu, J.; Shu, D.; Maruyama and T. Komiya, S. (2008), "Fossil association from the Lower Cambrian Yanjiahe Formation in the Yangtze Gorges area, Hubei, south China", Acta Geologica Sinica , 82 (6): 1124–1132, Bibcode:2008AcGlS..82.1124G, doi:10.1111/j.1755-6724.2008.tb00712.x
• Wang, Deng; Qiang, Yaqin; Guo, Junfeng; Vannier, Jean; Song, Zuchen; Peng, Jiaxin; Zhang, Boyao; Sun, Jie; Yu, Yilun (2024-02-19). Early evolution of the ecdysozoan body plan (Report). doi: 10.7554/elife.94709.1 .

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