Not sure if you have this info or not, but at Newfield, NY there is a road called "Dassance Road" and a Dassance Cemetery. Here is the web address for this cemetery:http://www.byjanmarie.com/cem/dassancecem.html
This is where Abner is buried and I believe his stone is still in existance. The Cemetery is, however, not in good condition. There are quite a few Dassance burials here as well as the wife "Patience" Ballou?, wife of Abner. I descend from my great grandmother Nora Dawson (Nora, Holland, Martin, Martin, Martin).