The zoning map, as amended from time to time, three copies of which are available during business hours in the office of the city clerk, is incorporated by reference and made a part hereof, and shall be, as amended, the official zoning map of the city of Hawthorne.

The geographical areas delineated on said zoning map shall be referred to as zones and, in accordance with the various designations thereof, shall be the areas and zones to which the use of classifications heretofore established by the provisions of the zoning ordinance, codified herein, shall be applicable.