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ZHANG Hong, SHEN Guanglong and HE Zonglian . Institute of Geology Xi''''an Branch, China Coal Research Institute, Northern Yanta Road, Xi''''an, Shaanxi Province, China. Department of Geology Northwest University, I North Taibai Road, Xi''''an, Shaanxi Province, China Zhu Xiling.1999. A Carbon Isotopic Stratigraphic Pattern of the Late Palaeozoic Coals in the North China Platform and Its Palaeoclimatic Implications[J]. ACTA GEOLOGICA SINICA(English edition),73(1):
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