Past studies have suggested Southeastern China (Fujian Province) as being the early known birthplace of O1b.
[4] Other studies suggest a complex origin that is inconclusive because of rising seawater to the east of China (which may have been walkable land mass).
This suggestion aims to draw an intersection to support the theory of both migration paths being in opposite spectrums geographically in East Asia.
The two primary descendants are: Prior to 2002, there were in academic literature at least seven naming systems for the Y-Chromosome Phylogenetic tree.
This allows a researcher reviewing older published literature to quickly move between nomenclatures.