All plats filed or recorded with the recorder before March 30, 1953, whether executed and acknowledged in accordance with this chapter or not, are validated and all streets, alleys, or public thoroughfares shown on these plats are considered to be dedicated to public use. The last plat of the area of record on March 30, 1953, is the official plat of the area as of that date, and the streets, alleys, or thoroughfares shown on it are considered to be dedicated to public use. The streets, alleys, or thoroughfares shown on an earlier plat of the same area, or any part of it, that are in conflict with those shown on the official plat are considered to be abandoned and vacated.