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LARGE SPHEROIDAL CHLOROPHYTA FOSSILS FROM DOUSHANTUO FORMATION PHOSPHORIC SEQUENCE (LATE SINIAN),CENTRAL GUIZHOU, SOUTH CHINA

LARGE SPHEROIDAL CHLOROPHYTA FOSSILS FROM DOUSHANTUO FORMATION PHOSPHORIC SEQUENCE (LATE SINIAN),CENTRAL GUIZHOU, SOUTH CHINA

贵州瓮安—开阳地区陡山沱期含磷岩系的大型球形绿藻化石