Filing. Every zoning law and every amendment thereto (excluding any map incorporated therein) adopted shall be entered in the minutes of the Town Board, and a copy, summary or abstract thereof (exclusive of any map incorporated therein) shall be published once in the official newspaper, and a copy of such local law or amendment, together with a summary or abstract of any map incorporated therein, shall be posted conspicuously at or near the main entrance to the office of the Town Clerk, and affidavits of the publication and posting thereof shall be filed with the Town Clerk. Such minutes shall describe and refer to any map adopted in connection with such local law or amendment.