The Taowan and Kuanping groups in the NQB have non-Smith stratigraphic sequence.
The provenance of the Taowan and Kuanping groups were mainly attributed to the NQB.
The northern boundary of the NQB should be placed on the north of the Taowan Group.
The NQB was an independent microcontinent from Mesoproterozoic to Neoproterozoic.
The Kuanping Ocean has been a major ocean basin before late Mesoproterozoic.