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The base of the Guzhangian Stage (Cambrian) has been ratified recently at the lowest occurrence of the cosmopolitan agnostoid trilobite Lejopyge laevigata (base of the Lejopyge laevigata Zone) in the Huaqiao Formation in the Luoyixi section, Guzhang County, Hunan Province, China.Sampling of the Luoyixi section in the boundary interval reveals 16 protoconodont and paraconodont taxa. The conodont succession...
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