(a) Any legal description prepared under the provisions of the Georgia Coordinate System provided by an Act approved March 6, 1945 (Ga. L. 1945, p. 218), and continued as a part of this Code until July 1, 1985, shall not be invalid.

(b) Any continual use of legal descriptions prepared under the terms of the Georgia Coordinate System provided by an Act approved March 6, 1945 (Ga. L. 1945, p. 218), and continued as a part of this Code until July 1, 1985, which have been recorded or filed in official records within the State of Georgia, shall not be invalid.