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The upper limit of the Changshan Formation had been traditionally put at the top of the Kaolishania pustulosa zone before 1983. After studying the trilobites material from Luotuolingzi of Benxi, Lu and Qian (1983) suggested to erect the Acanthometopus zone for the uppermost zone for the uppermost zone of Changshan Formation. Thus its upper limit should be extended to the top of the Acanthometopus zone instead of Kaolishania pustulosa zone. At the named locality of the Acanthometopyus zone in the Luotuolingzi section are contained only the zonal fossil and Trianguraspis (gen.nov.). At Baiyundong section of Tienshifu, the latter is associated with Elaphraella, Mansuyia, and Shirakiella are all the leading fossils of Changshan Formation. Owing to this case, the Acanthometopus zone is reasonable to be considered to put in Changshan instead of Fengshan Formation, and the upper limit of Changshan Formation is corresponding to be drawn at the top of the zone.

 

 

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