Although I have no proof of it, I think it possable that your Mary Ann LAWING that married John HALL was a daughter of David LAWING & Caroline PRICE.
David LAWING, son of Samuel LAWING & Isabella TASSEY. BORN: ___ _____ 1809 in Warren(now Cannon) Co.,TN. DIED: 15 AUG. 1833 in ____________________ Co.,____. [possably Warren(now Cannon) Co.,TN.] BURIED: __________________________________________________. MARRIED: 29 JAN. 1830 in Mecklenburg Co.,N.C. to Caroline PRICE.
Census Sources are...  1830-Warren Co.,TN.
I have nothing else on them, but they were in the area of Warren Co.,TN. that fell into the boundaries of Cannon County in 1836.