From a PDF posted below the site of the old Quaker cemetery Turkey Hill Rd, West Newbury, MA 01985 Americana Archives has the the list of those buried please let me know if I can look up your ancestor. See Abandoned graveyard saved by volunteers published in the Newburyport Daily News by John Tilton in 2010
Here are some finds and tidbits from the newspaper archives on Quaker meeting houses in the Newbury area and the grave sites.
From PDF FOLDER Newbury Quaker Meeting House photo in the collection of West Newbury Historical Society
PDF Quaker Cemetery Site