Around 1,000 years before present (YBP), the paternal lineage of E-Y18640 took shape as it diverged from the common ancestor E-Y18632 branch.
The most recent common ancestor (TMRCA) of this branch is estimated to have been born around 800 years before the present (YBP).
See it on 
YTree
SNPs
Currently defining this branch
Y18640, Y196932, Y18645, Y18642/BY8084
Samples
Within our knowledge, E-Y18640 is the ancestor of 11 Somali samples.
Sub-branches
8 sub-branches with Somali samples