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| type = Geological formation| country = {{CHN}}Guizhou Province>Guizhou & Yunnan Provinces25.9105.5display=inline,title}}12.394.5display=inline}}| area = | extent = Yunnan–Guizhou Plateau| thickness = | overlies = Guanling Formation| underlies = Zhuganpo Formation| subunits = | unitof = | namedby = | namedfor = China#China Guizhou| relief = 1| width = 250| float = center| places = }}| map_caption =}}The Yangliujing Formation is a Middle Triassic geologic unit found in the Guizhou and Yunnan Provinces of southern China.

Description

Most of the formation is represented by massive dolomites, indicative of a shallow-water depositional environment. Fossils are generally rare, but conodonts from the Anisian-Ladinian boundary (namely several species of Neogondolella) are known from the lower part of the formation. Some marine reptiles have been found in dolomitic limestone near Dingxiao, an area of Guizhou sometimes considered to preserve the upper part of the Yangliujing Formation. However, under a more restrictive definition of the Yangliujing Formation, the fossils of Dingxiao would instead belong to the overlying Zhuganpo Formation.Benton et al., 2013Sun et al., 2016

Fossil content

The following fossils have been reported from the formation:

Fish

• Omanoselache contrarius
• ?Parvodus sp.
• ?Semionotiformes indet.

Brachiopods

• Mentzelia sp.
• Nudispiriferina sp.

Bivalves

• Asoella illyrica
• Unionites sp.

Crinoids

• Traumatocrinus hsui

Conodonts

• Ozarkodina kockeli

References

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Bibliography

• LSA, Sun, Zuoyu, Jiang, Dayong, Ji, Cheng, Hao, Weicheng, 2016, Integrated biochronology for Triassic marine vertebrate faunas of Guizhou Province, South China,www.sciencedirect.com/science/article/pii/S1367912016300049, Journal of Asian Earth Sciences, en, 118, 101–110, {{doi|10.1016/j.jseaes.2016.01.004}} {{issn|1367-9120}}
• LSA, Benton, Michael J., Zhang, Qiyue, Hu, Shixue, Chen, Zhong-Qiang, Wen, Wen, Liu, Jun, Huang, Jinyuan, Zhou, Changyong, Xie, Tao, Tong, Jinnan, Choo, Brian, 2013, Exceptional vertebrate biotas from the Triassic of China, and the expansion of marine ecosystems after the Permo-Triassic mass extinction,www.sciencedirect.com/science/article/pii/S0012825213001128, Earth-Science Reviews, en, 125, 199–243, {{doi|10.1016/j.earscirev.2013.05.014}} {{issn|0012-8252}}
• LSA, Chen, L. D., G., Cuny, X. F., Wang, 2007, The chondrichthyan fauna from the Middle-Late Triassic of Guanling (Guizhou province, SW China), Historical Biology, 19, 291–300,
• LSA, Tong, J.-N., Z.-L., Lui, 2000, The Middle Triassic stratigraphy and sedimentary paleogeography of South China, Albertiana, 24, 37–47,