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New Observations on Phosphatized Spheroidal Fossils in Sinian Doushantuoan Phosphorites in Weng'an, Guizhou Province YIN Chongyu, GAO Linzhi, XING Yusheng Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037
.2001. Abstracts of Acta Geologica Sinica (Chinese Edition)Vol.75, No.2,2001[J]. Acta Geologica Sinica(),75(2):