Nathan Powell of Lee Co., GA 1840-50 did not marry Margaret Gamble.
The Coweta Co, GA marriage record shows that a Nathaniel Powell married a female w/ only the initials of M.G. on 28 Dec 1832. This was not the Nathan Powell of Lee Co., GA. There was no Margaret Gamble in Coweta Co., GA.
However, take a look at Leon County, FL marriage records: Nathan Powell mar. Margaret Gamble 12/26/1831, Marriage Book WX, page 22.
The 1830 US Census of Leon Co., FL shows Nathan Powell. The 1830 US Census of Jefferson Co., FL (county next to Leon Co.) shows Jeremiah Powell. Jeremiah Powell mar. Violet Gamble, widow of John L. Gamble of Twiggs Co., GA and Jefferson Co., FL.
Both Jeremiah and Nathan Powell show on various records in Twiggs Co., GA in the mid-1820's. As the census records above demonstrate, they had left Twiggs Co., GA and lived in Jefferson/Leon Co., FL before the 1830 census.
By 1834, Nathan Powell was a J.P. in Leon Co., FL. On 20 Oct 1835, Nathan Powell received a land grant in Leon Co., FL.
By 1840, both Jeremiah and Nathan Powell are both dead. Jeremiah Powell's widow, Violet, shows in the 1840 Leon Co., FL census.
From the Powell Family File at the Florida State Archives in Tallahassee, FL: "Jeremiah Powell came to Florida from Twiggs Co. GA about 1824. He first lived in Jefferson Co., FL and bought land in Leon Co., FL in 1830. His Last Will and Testament dated January 23, 1838 shows his wife was Violet, daughters names were Julia, Elizabeth M., and Caroline. His sons were Charles L., Adin and Joseph Powell. He died leaving an estate that included over 1700 acres and 44 slaves. Jeremiah Powell had removed to Tampa, FL shortly before his death on 24 Oct 1838. Violet Powell was the widow of John L. Gamble of Twiggs Co., GA. In Dec 1831, Margaret Gamble, daughter of John L. and Violet Gamble, married Nathan Powell, the only brother of Jeremiah Powell. Expenses of the estate of Jeremiah Powell shows the executor visited LaGrange, GA and Cahawba, AL."
From The Powell Family of Virginia and the South (Lucas), p. 40: "54c. Jesse Powell married Lydia and died 1777 in Johnston Co., NC, leaving sons Jeremiah and Nathan Powell."
Jeremiah Powell's obit from x23 Nov 1839, The Floridian (Tallahassee, FL): "Died on the 24th of October last at Tampa Bay, East Florida, Jeremiah Powell, Esquire, of this county (Leon Co.). The deceased was a native of North Carolina, but removed many years since to Georgia and soon thereafter the cession of this Territory to the United States, settled here. He was for many years before his death a class leader and one of the stewards of the Methodist Episcopal Church and by a life of unaffected piety, acquired the respect and esteem of his neighbors and associates. Having been for some time afflicted with a pulmonary affection, he was advised by his physician to go further south. In 1838, he visited South Florida and Cuba with the same object. While there, he took a violent and sudden cold which caused his death in a few days after its attack."
The Nathan Powell of 1840/50 Lee Co., GA is likely the same Nathaniel Powell of 1810 Robeson Co., NC, living close to other Powells, i.e., Douglas and Nicholas Powell. He married Charity Bird, the daughter of Rev. Isaac Bird, who died in Robeson Co., NC. Nathan Powell's sister, Loramey Powell married Joel Bird, son of Rev. Isaac Bird and sister of Charity Bird.
Another near neighbor in 1810 Robeson Co., NC was Levi Barfield. He also shows as a neighbor in Lee Co., GA.
Quinny Powell of Lee Co., GA moved to Monroe Co. AL by 1850 where many other Robeson Co., NC families removed to. Note there were two different Quinny Powells in early GA records. The one in Houston Co., GA and other counties was a different man.
Loami Powell of 1840 Lee Co., GA apparently died before 1850. His children show in poor school records in 1845 (Poor School Records, Folder 55, Image 2, at GA Archives.)
Thomas Powell b. 1839-40, shows in the household of Quinny Powell in 1850-60 Monroe Co., AL. It is not known if this is a son of Quinny or Loami Powell. Rev. Thomas Wm Powell moved back to GA between 1860 - 62, and became a Bapt. preacher. He died Berrien Co., GA in 1887.
If anyone knows of a male descendant of this Powell line who would like to test his Y-DNA, the Haplogroup is I1. Descendants of Douglas Powell of Robeson Co., NC are I1. Nicholas Powell of Robeson Co., NC and Marion Co., MS are also I1. All of Nathan Powell's male descendants will be I1 as well.
The Powell DNA Project is at: http://jpbdna.com/powell-surname-dna-project.htm