Yangliujing Formation

Yangliujing Formation
Stratigraphic range: Upper Anisian - Ladinian
Type	Geological formation
Underlies	Zhuganpo Formation
Overlies	Guanling Formation
Lithology
Primary	dolostone
Other	limestone
Location
Region	Guizhou Province, Yunnan Province
Country	China

The Yangliujing Formation is a Middle Triassic geologic unit found in southern China. 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.