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A NEW ALGAL FOSSIL FROM EARLY CAMBRIAN IN QINGZHEN COUNTY,GUIZHOU PROVINCE,CHINA

Yin Chong-yu (Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037)  
A new algal fossil was collected from the lower part of the Lower Cambrian, a Sinian-Cambrian boundary section in Abazhai of Qingzhen County,Guizhou Province.It was discovered in petrographic thin sections of a black laminated chert.The new fossil,Symphysosphacra radialis gen.et sp.nov.is a fossilized multicellular colony characterized by a surface layer of cells enclosed in an enve- lope,inner cavity permeated with dark dense mucilage embedded with numerous spherical units,hs difference from all morphs discovered in Precambrian,indi- cares that the genus may represent member of a new orde at the beginning of Cambrian.Its stratigraphic and biological significance merits our attantion.
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