I visited Gallipolis during the summer of 2000 and found in the local public library a document titled "Marriage Records, 1851-1900, Gallia County, Ohio - Michael L. Trowbridge, Compiler - [published by] Gallia County Historical Society P. O. Box 295, Gallipolis, OH 45631 - 1986"
I found a few records that would be of interest to the Adney family:
Andrew J. McMillin married Philinda M. Adney on October 20, 1852 - married by Andrew Edmiston.
(NOTE: I can't identify Philinda.)
James M. Hamilton married L. M. Adney on March 21, 1861 - married by Henry Shaner.
(NOTE: this is Lovena Maria Adney, b. 29 Sept 1838, daughter of Jonathan Adney. Hamilton's middle name is McGhee.)
Henry H. Adney married Elizabeth Blazer on September 29, 1867 - married by John W. Lewis.
(NOTE: Henry H., b. January 11, 1841, is son of Jonathan. His middle name is Harrison.)
This document is probably for sale by the Society.