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Thank you for the input. I will have to take a little time and see what I can work up from it. To answer the basic question, NO, I haven't been able to get beyond Moses Clark. (In 1820 there are land patents in Haywood for Josiah and Solomon Clark...in 1828 for Amos. Note biblical name pattern. I've been hung up on this...I think Moses must surely hook up with these folks.)
I also have looked into the angle that Moses' wife, Mary, was likely surname MORRIS. I'm working this on the basis that Moses' only son was named James Morris...which is in line with a common naming habit of the day, i.e., giving a male child the middle name of his mother's family. Visit to Brownsville Library, May 2003, failed to develop further information on Clark or Morris families except to note that both surnames were common...several families of each living there at the time. Geneology assistant, a Morris descendant, was unable to come up with any matches.
I haven't tried to come up with a departure date for Moses from TN to AR, but I suspect that it probably coincides with the end of the Civil War and the availability of cheap land in Arkansas. I have documents that place Moses in Sharp county in 1872, ordained minister, and signing bonds for various citizens.