This is not my line, but as Admin of the BARTLETT-DNA Project I am very interested in this line. At least on Ancestry tree has this BARTLETT line back to Stopham, England in the 1500s. We have one descendant of the Stopham BARTLETT line who has UK roots, and would very much like to find a living male BARTLETT from this line for Y-DNA testing.
I note that Marcus had two sons, and at least son Gordon had two sons who passed away in the past decade.
After Amanda died in 1857, Isaac remarried and had 2 more sons....
Are you related to this line, or have any knowledge of living descendants?