Y'know, I've been searching for the exact evidence you want for over 30 years.
In the Barney genealogy book, "Genealogy of the Barney Family in America," pp. 118, 289 it has: Erastus Barney, probably the son of Joseph and Sybel (Chapman) Barney, was born in 1782 (in Ashford, Conn. thinks his granddaughter, Malissa Ward). He married, first, Polly Spencer who died in 1832 in St. Lawrence Co., N.Y. Her father was said to be a fur trader and owner of the land on which St. Louis was built. Erastus Barney married, second, Keziah Closson who died before 1866 in St. Lawrence Co., N.Y. Erastus Barney came from Chittenden Co., Vermont to St. Lawrence Co., N.Y. in 1822. In 1866 he went to Greene Township, Erie Co., Pl. to live with his son, Gary C. Barney. He died November 25, 1874 "in his 92nd year," in Greene Township, Erie Co., Pa. Children, as listed in "The History of Erie Co., Pa.:" (12 children listed: Susan Marietta, Joseph (perhaps), William, Jacob, Henry, Lorenzo, Persis, Gary Columbus, Betsey, Amilla (or "Malissa"), George and Chauncy (was there another son?)) Editor's Notes: 5. Was there another son? Some say that, perhaps, Chauncey Barney, b. Sept. 19, 1807; d. Feb 19, 1875; md. Parmella ____, was their son.
Here's the best I can offer.Laura Mollrich, a descendant, has been searching for this evidence/link for nearly as long as I have.Laura Barney Mollrich, Laguna Beach, CA (1/18/01): "I just received a phone call from the Chapter Registrar of the Mission Viejo DAR, (I'm the new Regent there) some wonderful news for those of us who descend through Erastus and Polly (Spencer) Barney. The Daughters of the American Revolution have accepted Erastus Barney as being one of the sons of Joseph and Sybil (Chapman) Barney, the Revolutionary War soldier from Ashford, Windham, CT. I wrote an unbelievable preponderance of evidence along with new proofs I had located on Erastus Barney. I've been waiting for over a year after submitting the application with attached proofs. So, tonight's news was really terrific to hear."
-- Cliff in Virginia