I noticed your query and realized that Martha that was married to Thomas Ellis and wondered if he was related to Martha A. Ellis and Solomon Jones, Martha was 1/2 Choctaw. You can see the genealogy of this at
Sam Jones was born abt. 1847 most likely in Choctaw Nation, Indian Territory. His mother may have also been Ruth. He married Martha A. Ellis. It is believed that Sam and his wife Martha A. ELLIS did not have children, Martha is listed as 1/2 Choctaw. Sam died about 1912 in Atoka, Atoka Co., Oklahoma http://freepages.genealogy.rootsweb.com/~treetop/Solomon.htm...
and you should check further for more than this connection
Please let me know what you find or have as I'm interested in the BLACKMAN part.