A reversion to acreage shall be accomplished in conformance with Chapter 6 of the Subdivision Map Act. A parcel map may be filed for the purpose of reverting to acreage land previously subdivided and consisting of four or less contiguous parcels under one ownership. All maps filed for the purpose of reverting land to acreage shall be conspicuously so designated under the title “The Purpose of this Map is a Reversion to Acreage.” (Ord. 441 § 1 (part), 1988)