Dengying Formation
Dengying Formation | |
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Stratigraphic range: Ediacaran ~551–541 Ma PreꞒ Ꞓ O S D C P T J K Pg N | |
![]() Transition between uppermost Doushantuo Formation and lowermost Dengying Formation | |
Type | Formation |
Sub-units | See: Members |
Underlies | Yanjiahe Formation[1] |
Overlies | Doushantuo Formation |
Location | |
Region | Yangtze Gorges |
Country | ![]() |
The Dengying Formation is an upper Ediacaran (551-541 Ma[2]) fossiliferous geologic formation found in South China. It was deposited on a shallow marine carbonate platform.[3]
Members
Listed by ascending age:
- The Hamajing Member is characterized by light grey, medium- to thick-bedded dolomite, intercalated with thin layers of chert.[3]
- The Shibantan Member is interpreted to represent a subtidal environment and is composed of dark grey, thin-bedded bituminous limestone. It is the most fossiliferous of the Dengying Formation members and has yielded several trace fossils, such as Lamonte,[4] as well as possible lobopodian trackways. [5]
- The Baimatuo Member consists of light grey, thick-bedded dolomite.[3]
Traditionally, the Tianzhushan Member was considered to be the uppermost unit of the Dengying Formation. However, its small shelly fossils and Micrhystridium-like acritarchs are a shared characteristic with the Cambrian Yanjiahe Formation.[3]
Genera
- Cloudina
- Lobodiscus
- Palaeorhopalon
- Paracharnia
- Shufangtubulus
- Sinotubulites
- Yangtziramulus
Ichnogenera
- Helminthoidichnites
- Lamonte
- Torrowangea
See also
- List of fossiliferous stratigraphic units in China
- Ediacaran biota
References
- ^ 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)". Journal of Paleontology. 83 (1): 30–34. Bibcode:2009JPal...83...30D. doi:10.1666/07-147R.1. S2CID 129410378. Retrieved 15 August 2014.
- ^ Condon, Daniel; Zhu, Maoyan; Bowring, Samuel; Wang, Wei; Yang, Aihua; Jin, Yugan (2005). "U–Pb ages from the Neoproterozoic Doushantuo Formation, China". Science. 308 (5718): 5–98. Bibcode:2005Sci...308...95C. doi:10.1126/science.1107765. JSTOR 3841402. PMID 15731406. S2CID 11673032.
- ^ a b c d Zhou, Chuanming; Xiao, Shuhai (2006). "Ediacaran .δ13C chemostratigraphy of South China". Chemical Geology. 237 (1–2): 89–108. doi:10.1016/j.chemgeo.2006.06.021.
- ^ Meyer, Mike; Xiao, Shuhai; Gill, Benjamin C.; Schiffbauer, James D.; Chen, Zhe; Zhou, Chuanming; Yuan, Xunlai (2014). "Interactions between Ediacaran animals and microbial mats: Insights from Lamonte trevallis, a new trace fossil from the Dengying Formation of South China". Palaeogeography, Palaeoclimatology, Palaeoecology. 396: 62–74. Bibcode:2014PPP...396...62M. doi:10.1016/j.palaeo.2013.12.026.
- ^ Xiao, Shuhai; Chen, Zhe; Pang, Ke; Zhou, Chuanming; Yuan, Xunlai (January 2021). "The Shibantan Lagerstätte: insights into the Proterozoic–Phanerozoic transition". Journal of the Geological Society. 178 (1). Bibcode:2021JGSoc.178..135X. doi:10.1144/jgs2020-135. ISSN 0016-7649.