Rev. Robert's Grave site is at St. Mark's Church, Niagara (formerly Newark). Info from their pamphlet (about 1965) 'On entering the Church, note the Addison Tablet, and the case of historical items on the left, and the Creen Tablet on the right.' (I have a rather poor newspaper picture of what may be this Tablet). 'The first Rector's remains are interred under the stone tablet on the west side of the north transept outside, having been placed there when the basement was excavated.'