【摘要】 讨论防城湾水动力条件、地貌特征及沉积物组成。其中，水下动力地貌有６种类型：潮间浅滩、潮流冲刷深槽、水下拦门沙坝、水下沙嘴、水下岸坡、海底平原。表层沉积物类型有６种：砂砾、粗砂、粗中砂、中细砂、细砂、粉砂质粘土。沉积物中重矿物组合为钛铁矿—锆石—电气石。沉积物中有孔虫、介形虫，划分为４个组合带：卡纳利拟单栏虫组合；毕克卷转虫变种组合；毕克卷转虫—异地希望虫组合；毕克卷转虫变种—球室刺房虫—异地希望虫组合更多还原

【Abstract】 The hydraulic dynamic conditioin, morphological feature and sedimental composition from Fangcheng Bay were discussed. There are six types of the underwater dynamic morphology in Fangcheng Bay: intertidal shoal, tidal current scour, underwater entrance bar, underwater sandy mouth, underwater slope, submarine plain. The surface sediment possess six types: sandy gravel, coarse sand, coarse middle sand,middle fine sand, fine sand,silty clay. The heavy minerals are named as ilmenite-zircon-tourmaline assemblage in the sediment. Foraminiferan and ostracod are abundant in the sediment. Its four assemblage zones can be divided as follows: Haplophragmoides cannariensis assemblage zone, distributed in river mouth forked course; Ammonia beccarii var. -H.cannariensis assemblage zone intertidal zone; A. baccarii var. -Elphidium advenum assemblage zone in underwater slope; A.beccarii var. -Schackoinella globosa- E.advenum assemblage zone in shallow sea.更多还原