I can't answer your question, but my Black ancestors are from the Cullman and Walker county areas.
If any of these fit into your tree, I'd love to compare notes.
James Black b: March 19, 1825 in Walker County, AL d: January 1891 in Dora, AL; married Elizabeth Peak b: 1829 in Alabama
William Black b: November 5, 1846 in Walker County, AL d: January 25, 1906; married Martha Ann Davis b: February 25, 1851 in Alabama d: October 25, 1910
Mary Elizabeth Black b: 1853
Marion M. Black b: Abt. 1866
Benjamin Franklin Black b: Abt. 1868
Nancy Elizabeth Black b: Abt. 1871
Francis Louise Black b: Abt. 1874
Rachel Black b: 1858
James Lawton Black b: 1862
Martha Black b: 1860