PLATS AND SUBDIVISIONS - ORDINANCES - CITY, TOWN OR COUNTY - TIME FOR ADOPTION - APPLICABILITY OF CHAPTER 271, LAWS OF 1969, EX. SESS., TO CERTAIN SUBDIVISIONS A subdivision of land containing no dedication and no lots or tracts smaller than five acres in size may be made subject to the provisions of chapter 271, Laws of 1969, Ex. Sess., if the county, city or town in which the land is situated enacts an ordinance so providing and it is not necessary that such an ordinance shall have been enacted prior to the effective date of the 1969 act.