The Naobaogou Formation is a

geological formation A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics (lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock expo ...

in the

Daqing Mountains The Yin Mountains, also known by their Chinese name as the Yin Shan or Yinshan and by various romanizations as the Daqing Mountains, are mountains in the Eastern Gobi Desert steppe of the Inner Mongolian Autonomous Region of China. The Yellow Riv ...

China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...

. It is likely of

Lopingian The Lopingian is the uppermost series/last epoch of the Permian. It is the last epoch of the Paleozoic. The Lopingian was preceded by the Guadalupian and followed by the Early Triassic. The Lopingian is often synonymous with the informal te ...

(Late Permian) age. It consists of three rhythms of sediment, labeled members I-III primarily of purple

siltstone Siltstone, also known as aleurolite, is a clastic sedimentary rock that is composed mostly of silt. It is a form of mudrock with a low clay mineral content, which can be distinguished from shale by its lack of fissility. Although its permeabil ...

, but each with a thick basal conglomerate bed. It is notable for its fossil content, producing one of the most diverse Late Permian vertebrate faunas outside Russia and South Africa.

Vertebrate fauna

References

{{reflist Permian System of Asia Permian China Lopingian geology