Here is some interesting facts I've come across regarding the burial ground of James and Ruth Washburn. It is a history of property owned by James Washburn in Woodstock, VT from "The History of Woodstock VT" He was granted this land for his service in the Battle of Saratoga of the Revolutionary war. I descend from his son, Joseph Rice Washburn. After Ruth died, James married a Mariah and as you mentioned had 4 children by her. From what I understand, their daughter Ruth was the "family keeper of records" and that when she died her records went to a nephew with the surname of McCrillis. I'm sure all the information we're both looking for is included in those records.
p.9, James built a log house on land he settled on in 1777. Lived there until November 1787, then sold to George Samson, Sr. The log house used by Sampson for a few years. Then he tore it down and lived in newly built house a few rods in front of log house site. Samson Jr. lived here 'til death in August 1870. [Since his wife Ruth died in 1785, this farm should be the location of the family burial ground.] (E.R. Britain notes that James bought another place of 10 acres in Woodstock Village, near the Elm Street bridge. On April 20, 1790 he bought a 3/4 interest in a grist and saw mill....)
(Per E.R. Britain, "The cemetery remained intact until some time in the youth of Mr. Minor, 95 years of age in 1960, which would place it in the early 1880s, when during the ownership of Almon Davis, it was destroyed by Davis. No trace of it now remains, The present owners and occupants of the farm, Mr. and Mrs. Raymond Robinson are fully aware of these facts." Mr. Britain filed this information with a Vermont State Agency who was compiling a list of the graves of Soldiers of The Revolution, and their wives for later publication. )