层序IV，在陆坡和岛弧地区都有分布，但是在海槽盆地内部区域缺失该层序，为上新世沉积物。
We found that sequence IV, which is Pliocene sediments, only exists in the slope and island arc slope and not distributes in the trough basin.
层序I，由海槽西北部陆坡可以连续追踪至海槽区域，为全新世松软沉积物。
Sequence I can be distinguished from the northwest slope to trough basin and is Holocene softy sediments.
陆坡下部区的火山碎屑及浊流沉积物中放射虫化石亦不丰富。
In the low area of continental slope, radiolaria fossils are poor in the volcanic cinders and turbidite.
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