Further sea-floor spreading led to the occurrence of oceanic crust in Babu Basin and the Nanpanjiang Sea exceeded beyond 20 latitudes from north to south in Early Carboniferous.

• 进一步的海底扩张导致早石炭世时八布海盆出现洋壳，南盘江海成为南北超过20个纬度的小洋盆。