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Samples of Upper Ordovician marine carbonates from four sections on the Yangtze Platform(1,the Liangcun section northeast of Xishui County Town,Guizhou Province; 2,the Zhuazhuayan section southwest of Leibo County Town,Sichuan Province; 3,the Xiaogangwan section east of Wulong County Town,Chongqing Municipality; 4,the Shatan section north of Nanjiang County Town,Sichuan Province)have been analyzed for carbon isotope(δ13C)chemostratigraphy.