【摘要】 系统分析北海外沙泻湖ＣＫ１０钻孔岩芯的硅藻、有孔虫、介形虫化石， 并进行１４Ｃ年代测定， 探讨硅藻、有孔虫组合特征、沉积相演化和地层年代。该孔全新世地层硅藻化石群自下而上划分为： Ⅰ． 波缘曲壳藻（Ａｔｈｎａｎｔｈｅｓｃｒｅｎｕｌａｔａ）—亲缘桥弯藻（Ｃｙｍ ｂｅｌｌａ ａｆｆｉｎｉｓ） —披针桥弯藻（Ｃｙｍ ． ｌａｎｃｅｏｌａｔａ） ，Ⅱ．亲缘桥弯藻—波缘曲壳藻—卵形菱形藻（Ｎｉｔｚｓｃｈｉａ ｃｏｃｃｏｎｅｉｆｏｒｍｉｓ） ， Ⅲ． 亲缘桥弯藻—波缘曲壳藻—史密斯双壁藻（Ｄｉｐｌｏｎｅｉｓｓｍ ｉｔｈｉｉ），Ⅳ． 波缘曲壳藻—亲缘桥弯藻—条纹小环藻（Ｃｙｃｌｏｔｅｌｌａ ｓｔｒｉａｔａ）， Ⅴ．卵形菱形藻—具槽直链藻（Ｍｅｌｏｓｉｒａ ｓｕｌａｔａ）—柱状小环藻（Ｃｙｃ． ｓｔｙｔｏｒｕｍ ）， Ⅵ．条纹小环藻—柱状小环藻， Ⅶ． 具槽直链藻—条纹小环藻—卵形菱形藻， Ⅷ． 柱状小环藻等８ 个硅藻组合带。有孔虫群自下而上划分为： Ⅰ． 毕克卷转虫变种（Ａｍ ｍ ｏｎｉａ ｂｅｃｃａｒｉｉ ｖａｒ．） —瘦瘪雅得虫（Ｊａｄａｍ ｍｉｎａ ｍ ａｃｒｅｓｃｅｎｓ） ， Ⅱ． 毕克卷转虫变种—异地希望虫（Ｅｌｐｈｉｄｉｕｍ ａｄｖｅｎｕｍ ）—球室?更多还原

【Abstract】 Diatom,Foraminifera,Ostracoda fossils and its features of assemblages,evolution of sedimentary facies in Waisha Lagoon,Beihai,were analysed systematically.Strata ages had been discussed by 14 C dating.Holocene Diatom fossils of the drill hole could be divided from bottom to top:Ⅰ Athnanthes crenulata-Cymbella affinis-Cym lanceolata,Ⅱ Cym affinis-Ath crenulata-Nitzschia cocconeiformis,Ⅲ Cym affinis-Ath crenulata-Diploneis smithii,Ⅳ Ath crenulata-Cym affinis-Cyclotella striata,Ⅴ Nit cocconeiformis-Melosira sulata-Cyc stytorum,Ⅵ Cyc striata-Cyc stytorum,Ⅶ Mel sulata-Cyc striata-Nit cocconeiformis,Ⅷ Cyc stytorum Foraminifera groups from bottom to top:Ⅰ Ammonia beccarii var -Jadammina macrescens,Ⅱ A beccarii var -Elphidium advenum-Schackoinella globosa,Ⅲ A beccarii var -Haplophragmoides canariensis,Ⅳ A beccarii var -E advenum,Ⅴ A beccarii var -Miliammina fuasca.Since early Holocene Waisha Lagoon,Beihai, underwent revotution:riverine flood plain→river mouth marsh→riverine flood plain→river mouth marsh→estuary→semi enclosed lagoon→estuary→semi enclosed lagoon.Holocence strata could be divided into early Holocene(1 000 a B.P.~8 000 a B.P.),middle Holocence(8 000 a B.P.~2 500 a B.P.),late Holocence(2 500 a B.P.~present).更多还原