Even with an ancestry membership the source gives no clues where to look. There are several unsourced trees with Jonathan and Experience. No help there.
A search for Experience Oberton provides a clue, but dates don’t mesh for her to marry David Keith in 1804, if Jonathan didn’t die until 1810. From Eaton, Cyrus,. History of Thomaston, Rockland, and South Thomaston, Maine : from their first exploration, A.D. 1605 : with family genealogies. Hallowell Me.: Masters, Smith & Co., printers, 1992. p. 293