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Xinminbao Group

The Xīnmínbǎo Group is a group of geological formations in north central China. They occur across a large depression between the Altai Mountains of Mongolia to the north and the Qilian mountains of the Qinghai Plateau to the south, in the Gōngpóquán (公婆泉) and Suànjǐngzi (算井子) basins, and also in the neighbouring Jiuquan Basin.

Geology
The group is made up of three main formations. Chijinbao Formation This consists of a lower red unit of coarse conglomerates grading to fine sandstones representing river channel to alluvial fan deposits, and an upper unit of red clastic sediments from either overbank deposits in a meandering fluvial environment, or accumulation in a shallow lacustrine or paludal (marsh) environment. Digou Formation This consists of grey siltstones and calcareous mudstones comprising two sequences of fluvio-lacustrine sedimentation with some alluvial fan and littoral (lake-shore) deposits. Zhonggou Formation This consists of red siltstones and mudstones in a series of upwardly coarsening cycles of lacustrine sediments. == Vertebrate fauna ==
Vertebrate fauna
The dinosaurs of the Xinminbao Group are collectively referred to as the Mazongshan Dinosaur Fauna, representing a unique dinosaur assemblage from all other known dinosaur faunas. Ceratopsians Ornithopods Saurischians Thyreophorans Indeterminate ankylosaur remains are known from the group. Crocodilians Indeterminate crocodilian remains are known from the group. Fish Pterosaurs Turtles == See also ==
Source: Wikipedia ↗
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