【摘要】 本文记述了江苏北部兴化县下第三系戴南组盘星藻化石1属、15种、2变种,其中5新种。根据盘星藻生态条件的分析,对戴南组的沉积环境进行了讨论。更多还原

【Abstract】 In this paper the fossil Pediastrum algae found from the Dainan formation(Lower Tertiary)of northern Jiangsu are described.They contain 15 species and2 varieties(including 5 new species)as listed below:Pediastrum Boryanum(Turp.)Meneghini,P.duplex Meyen,P.simplex(Meyen)Lem.,P.simplex var.duodenarium(Bailey)Rabenhost,P.tetras(Ehr.)Ralfs,P.araneosam(Raciborski)G.M.Smith,P.integrum var.priva Printz,P.kawraiskyi Schmidle,P.muticum Kuetzing,P.biradiatum Meyen,P.clathratum(Schroeter)Lem.,P.singhuaensis Chu et Tseng(n.sp.),P.bimammilosum Chu et Tseng(n.sp.),P.quadriangalatum Chu et Tseng(n.sp.),P.multidentatum Chu et Tseng(n.sp.)and P.parakawraiskyi Chu et Tseng(n.sp.).All except new species closely resemble modern Pediastrum species living infresh water almost in every respect.Modern Pediastrum is restricted to fresh-water,fluvial and lacustrine environments.The presence of great quantities of Pediastrumin the Dainan formation of northern Jiangsu indicates a lacustrine origin.更多还原