The districts are bounded and defined as shown on a map entitled "Official Zoning Map of the Town of Sullivan" which accompanied and which, with all explanatory matter thereon, was made a part of this chapter as adopted on July 30, 1979, and as from time to time amended by amendments to this chapter.[1] All amendments to this chapter, from time to time adopted by the Town Board, which were duly adopted and in effect shall be certified as duly adopted and in effect by the Town Clerk, and the Official Zoning Map shall thereby be deemed thereby amended in conformity with each such amendment.