Dick:I think I can be of some help.I too am descended from Miles Gazley of Flint, MI, but through his second marriage to Ruth Pettengill, not his first marriage to Betsey Maria Harmon.I believe that Miles is the son of William C. Gazley and Patty of Onondago County, New York.The records of the Valley Presbyterian Church indicate that Miles was the oldest child of William and Patty, born 10/20/1807, followed by Ward, Martha, Lucy Ann and maybe another child.
By the way, Betsey's father's name was Carlos Harmon, hence the name of her second son was also Carlos, your ancestor.
Miles and Betsey were married in Manchester, New York in 1829.It is said she was born in Hartford, CT in 1807, though this does not match with her 1850 census information, which shows her as being 40 and born in New York.
Betsey died on March 21, 1853 of consumption.Miles remarried a much younger woman, Ruth Pettengill Conklin, and they had a child in 1860, Emma, my great-grandmother.Miles died 6/7/1862, also of consuption.
All of the foregoing is derived from a number of different sources, and if given a chance, I can probably give you cites to all of it.Before I do that, I wanted to make sure we are on the same wavelength.
What I do not have is any information about William C. Gazley's ancestors, which you apparently do, nor any information at all about Patty.I would be very interested to receive any information you can provide me about them.Hope this is helpful.