Courtesy of the David Vance SAPP process.

Dave Vance Named FamilyTreeDNA General Manager
www.jdvsite.com - The SAPP algorithm
0---Node# 899: Est. TMRCA: recent.
        1---508181 Samuel Walker 1801-1870 Unknown Origin:  Big Y-700, 111 STRs FTDNA Known SNP: BY21224 Est. TMRCA: recent. Kit is courtesy of the FTDNA M222 Project.
        1---8853 William H Walker 1761 Scotland: Map Unknown, 111 STRs FTDNA Known SNP: M222 Est. TMRCA: recent. Kit is courtesy of the FTDNA Ulster Heritage Project.

Note: Dates are measured from the epoch which is 1950 and age estimates vary by 15% to 20%. The few red colored ages (on the SNPs) and the green age at the top is Family Tree DNA's eatimate for the SNP itself. The green in-line ages are the SAPP estimate for the kits being analyzed (not the SNP).