Guanling Formation

Guanling Formation Stratigraphic range: early-mid Anisian () ~247–245 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Type	Geological formation
Underlies	Yangliujing Formation
Overlies	Jialingjiang Formation
Lithology
Primary	Mudstone, limestone
Other	Dolostone
Location
Coordinates	25°30′N 104°54′E / 25.5°N 104.9°E / 25.5; 104.9Coordinates: 25°30′N 104°54′E / 25.5°N 104.9°E / 25.5; 104.9
Approximate paleocoordinates	11°42′N 94°12′E / 11.7°N 94.2°E / 11.7; 94.2
Region	Guizhou & Yunnan Provinces
Country	China
Extent	Yunnan–Guizhou Plateau
Guanling Formation (China) Guanling Formation (Guizhou) Show map of ChinaShow map of GuizhouShow all

The Guanling Formation is a Middle Triassic (Anisian or in the regional chronostratigraphy) geologic formation in southwestern China.

Description[]

The formation encompasses two members. The first member is primarily calcareous mudstone and dolomite, indicative of a coastal environment. The second member is a thicker marine sequence of dark micritic limestone with some dolomite. Two distinct fossil assemblages are found in the second member. The older Luoping biota preserves abundant arthropods along with fossils from other invertebrates and vertebrates, which are rare but well-preserved. The slightly younger Panxian fauna has a more diverse and common assortment of marine reptiles such as sauropterygians.^[1]

Fossil content[]

Among others, the following fossils were reported from the formation:

References[]