The subdivision plans adopted by the Town Board on the 10th day of April 1950, and also subsequent changes and amendments thereto, are repealed and declared to be of no effect on and after the effective date of this chapter; except that, as to violations against the prior regulations which were in existence prior to the effective date of this chapter and which would be violations of this chapter if not in existence prior to the effective date thereof, said prior regulations shall remain in full force and effect.