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Naming Stratigraphic Section of Guojia'ao Sandstone

September 24,2024

It is located in Guojiaao, Da’an District, Zigong. Guojia’ao Sandstone was named by geologists Tan Xichou and Li Chunyu in 1933 according to a suite of sandstone exposed here as a lithologic stratum of Ziliujing Bed. Today, it belongs to Ma’anshan Member of the Lower Jurassic Ziliujing Formation. Guojia’ao Sandstone, with well-developed cross or wave beddings and various ripples and 5-10 m thick, consists of yellowish grey siltstone and quartzose sandstone, and is sediments deposited in the environment of lakeshore shoal.



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