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The Eustatic Cycles and the Depth of Water Mass of the Latest Ordovician Wufengian in the Yangtse Basin

HE Wei-hong WANG Xiao-feng BU Jian-jun (Centre for Stratigraphy and Paleontology, China Geological Survey, Yichang Hubei 443003)  
On the basis of discussing the paleogeographic reconstruction, the change of lithology and biota through the section, the cycles of Ce anormaly and the indicating biota for depth of water mass from the latest Ordovician in the Yangtze Basin, the author holds that 5 eustatic cycles in the latest Ordovician Wufengian and that, the depth of water mass is at least 50 to 80 metres (respect to Guanyinqiao Bed) and at most 500 metres or so.
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