I've been able to get my Dotson's back to William Dotson and Catherine Lee in Belmont Co., OH. I believe William is the William Dodson on the 1840 census in Warren Twp., Belmont Co. I believe William ties in with the Calvert Co., MD Dotson's, unfortunately, I've never been able to find the link.
William and Catherine were the parents of Rebecca, James, and William Henry. William Henry is my line. William, the father, seems to have died in the mid 1840's.