I quote UB on 74:0.1 (828.1)
ADAM AND EVE arrived on Urantia, from the year A.D. 1934, 37,848 years ago. It was in midseason when the Garden was in the height of bloom that they arrived.
Although estimates are scientific, there is always some uncertainty.
In principle, both geographic location and time should match for both mitochondrial DNA and Y-chromosome, but due to uncertainty, haplogroup candidates should be observed by a larger perspective.