Looking for Burial Location of Canterbury Nb Residents James Matilda Ferguson

I'm trying to locate the burial location of my great grandparents, James & Matilda Ferguson. They immigrated to New Brunswick from Ireland in 1833. New Brunswick census records of 1851, 1861, & 1871 show them as residents of Canterbury. I cannot find any death records or cemetery records. James was born in 1791 in Londonderry, Northern Ireland; Matilda was born in 1801 in Ireland.