Joseph M. McDowell & Mary Queen, 1839

Source: Lumpkin County, Georgia, Marriage Book A-1, 1838-1849
(click to enlarge)

Georgia
Lumpkin County
To any Judge Justice of the Inferior Court Justice of the Peace or Minister of the Gospel  You are hereby authorized to join together in the holy Estate of Matrimony Joseph M. McDowell* and Miss Mary Queen and to make your return on this license to this office of their actual _ intermarriage and of the day on which the same was solemnized  Given under my hand this 16th of June 1839. 
M.P. Quillian C.C.O.
By Bessy Turner
June 16th 1839. I have this day Join together in the holy Bands of Matrimony Joseph M McDowell and Miss Mary Queen  Bessy Turner J.P.
____________

*I am speculating that this may actually be Joseph Moffett McDowell, son of Joseph "P.G." McDowell and Mary Moffett, claimed by many to have died young. Census data proves that both bride and groom, as well as their parents, were born in North Carolina. In 1822, sixty-one families moved to Georgia's Nacoochee Valley in Habersham County from Burke County, North Carolina, during the Georgia Gold Rush. Lumpkin County, just west of Habersham, was the area where the rush initiated, and was created in 1832 in conjunction with the seizure and survey of Native American lands. (White County was formed between the two counties in 1838 from parts of Habersham and Hall counties. Joseph and Mary McDowell's federal census data indicates they lived in White County 1860-1880 after residing in Habersham 1850, though they may not have physically moved.)
Another key to the theory is Joseph and Mary's third child, a son, my great-great-grandfather. Born 1847 in Habersham County, Georgia, he was named Adolphus Erwin McDowell. In 1848, James Moffett McDowell (born 1791), who had inherited McDowell House at Pleasant Gardens (in what by then had become McDowell County, North Carolina) from his late father P.G., deeded the property over to his late wife Margaret Caroline Erwin's brother Adolphus Lorenzo Erwin in order to pay off debts. The matching names of Joseph's son Adolphus Erwin and possible brother-in-law Adolphus Erwin are simply too blatant to pass off as random coincidence. The implication of a Pleasant Gardens connection is too strong to ignore. Research is ongoing. 

Update 12.22.16:

A "Letter of Dismission" in the name of Joseph McDowell is on file in the Georgia Wills & Probate Records 1742-1992. The item is in the Letters of Dismission: Administration, Guardianship and Executors, Vol. B, 1878-1932. His Administrator was J.M. Reese, probate date is 4 January 1886, and the place of record is Gordon County, Georgia. 
Joseph McDowell's possible nephew Dr Joseph Lewis McDowell, was born in North Carolina in 1812, and later made his home in Gordon County, Georgia. He was the first-born of Joseph "P.G." McDowell's own first, John Moffett McDowell, born at "Pleasant Gardens," Burke County, North Carolina, in 1787.

Joseph of Pleasant GardensCongressional Biography

From the Biographical Directory of the United States Congress: 

"McDOWELL, Joseph, (cousin of Joseph McDowell [1756-1801]), a Representative from North Carolina; born at 'Pleasant Gardens,' near Morganton, Burke (now McDowell) County, N.C., February 25, 1758; attended schools at Winchester, Va.; served in the Revolutionary Army and was commissioned a major; was subsequently general of militia; studied law; was admitted to the bar in 1791 and practiced in Burke, Rowan, and Rutherford Counties, N.C.; member of the state house of commons 1785-1792; elected as an Anti-Administration candidate to the Third Congress (March 4, 1793-March 3, 1795); renominated but declined to be a candidate for reelection in 1794; resumed the practice of law and engaged in agricultural pursuits; member of the commission appointed to settle the boundary line between North Carolina and Tennessee in 1796; died on his estate, 'Pleasant Gardens,' near Morganton, N.C., March 7, 1799; interment at Round Hill on his estate."

Joseph of Quaker MeadowsCongressional Biography

From the Biographical Directory of the United States Congress: 

"McDOWELL, Joseph, (father of Joseph Jefferson McDowell and cousin of Joseph McDowell [1758-1799]), a Representative from North Carolina; born in Winchester, Va., February 15, 1756; moved to North Carolina with his parents in 1758; attended the common schools and Washington College (now Washington and Lee University), Lexington, Va.; served against the Indians on the frontier and later took an active part in the Revolution, attaining the rank of colonel; engaged in planting; elected to the Continental Congress in 1787, but did not attend; delegate to the State constitutional convention which ratified the Constitution of the United States in 1789; member of the State house of commons in 1791 and 1792; unsuccessful candidate for election in 1794 to the Fourth Congress; elected as a Republican to the Fifth Congress (March 4, 1797-March 3, 1799); was not a candidate for renomination in 1798; moved to Kentucky in 1800, but returned to North Carolina in 1801; died at his brother's home at Quaker Meadows, near Morganton, Burke County, N.C., February 5, 1801; interment in Quaker Meadow Cemetery, on his father's plantation, near Morganton, N.C."