Here is a link from "Billion Graves" with a faint picture of a stone in Chesley Cemetery for Edward Robinson b. Feb 13, 1814 -- d. 1888, looks like. His stone must have been missed in the Canada Genweb project.
http://billiongraves.com/pages/record/Edward-Robinson/467953...link for Charlotte Robinson:
http://billiongraves.com/pages/record/Charlotte-Robinson/634...looks like the same stone - maybe the opposite side ???