O1a-M119 and O1b-M268 share a common ancestor, O-F265 (a.k.a. O-F75) approximately 23,400 CI 21,600 to 25,300 YBP. O-F75, in turn, coalesces to a common ancestor with O3-M122 approximately 24,700 CI 23,000 to 26,500 YBP. Thus, O-F75 existed as a single haplogroup parallel to O3-M122 for a duration of approximately 1,300 years (or anywhere from 0 to 4,900 years considering the 95% CIs and assuming that the phylogeny is correct) before breaking up into its two extant descendant haplogroups, O1-MSY2.2 and O2-M268.