In some areas of the trough basin, sequence V, which is residual Miocene sediments, deposited beneath the sequence III.
盆地内某些区域，在层序iii之下，还存在层序v，为残留的中新世沉积物。
Xisha trough basin is the advantage oil and gas exploration area of the northern continental slop of the South China Sea.
西沙海槽盆地是南海北部陆坡深水区的有利油气勘探区域。
There is not the contemporary plate-tectonic system in the researching area. However, the active forms of polycycle trough (basin) developed in the area.
本区不存在现代板块构造体系，而具有多旋回海槽(盆)的活动形式。
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