Sorry I can't help you with you question but am wondering if we have a connection with the Jenkins family (and the Marsden family).
My line is as follows
Mary Jenkins (Maiden name unknown) b abt 1797 Breconshire, husband's name unknown.
A Daughter: Sarah Jenkins b abt 1826 Panteague, marr Jacob Jones abt 1845, she died abt 1901. (Mary also had a son David b abt 1830)
Sarah & Jacob Jones Children: 7 including;
Eleanor Marsden Jones, b 1866 Usk, d USA 1914, marr Edward Harris in Abersychan 1891
Eleanor Marden Jones and Edward Harris children:
Frances Thirza Ruth Harris (my grandmother)
The areas I know these folks were connected with are:
Jones (Trevethin, Panteague, Usk)
Harris: Abertillery, Crickhowel (Brecon)
The senior Harris and Jones family are buried in Ebenezer Baptist Church yard, Pontnewydd near Pontypool (they were related to the pastor)
Several of their marriage and birth records were found in Bedwelty.
Do you think there is a connection? Could your Richard Jenkins, Jr and Mary Anne Marsden be my Mary Jenkins? Do you know their children's names?
Thank you,
Ruth Thirza