Dictionary of Geotourism

2020 Edition
| Editors: Anze Chen, Young Ng, Erkuang Zhang, Mingzhong Tian

Permian-Triassic Boundary Section in Dalongkou, Xinjiang

Reference work entry
DOI: https://doi.org/10.1007/978-981-13-2538-0_1865

This section is one of the most important boundary stratotype sections and points in northern China. It is located in Dalongkou in Santai Town, Jimusaer County, Xinjiang Province. The lower part of the Lower Triassic Series is the Dalongkou Stage. The rocks are characterised by purple silty mudstone and sandstone as well as a small amount of fine sandstone in the lower part (referred to as the upper part of the Guodikeng Formation). The upper and middle parts contain alternating layers of purplish red mudstone and silty sandstone with uneven thickness that are interbedded with greyish green lithic sandstone and silty sandstone (Jiucai Yuan Formation). The bottom of the Dalongkou Stage is the Permian-Triassic boundary and is largely signified by the first appearance of the fossil reptile Lystrosaurus and Lundbladispora pollen. This stage contains abundant fossils of ancient vertebrates, plants, pollen, Ostracoda and Estheria, which can be categorised into different combinations. The...

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