The locations and boundaries of the zoning districts hereby established are shown on a map entitled the "Zoning Districts of the City of Fulton, New York," originally adopted May 27, 1965; said map has been duly amended from time to time by the Common Council to reflect amendments in zoning district boundaries or designations. The Zoning District Map and all notations, references and other information shown thereon are hereby declared to be a part of this chapter. The official copy of the Zoning District Map shall be filed with the City Engineering Office. The City Engineering Office shall delineate on the Zoning District Map all amendments to the district boundaries which are authorized by ordinance immediately upon the effective date of such ordinance, indicating the title and date of the revision.